buildozer -v android debug - issues

[Marcello Musarra]

I am having issues to debug apk using kivy and buildozer. My app uses matplotlib and its backend from garden as well as graph. I have main.py and main.kv

Please advise if there is any easiest and comfortable way to use interactive and self-updated (by user input change) math charts.

Help to solve the issues is much appreciated.

running

buildozer -v android debug

When I leave

# (list) Garden requirements
garden_requirements = graph,matplotlib

I get this error

Failed building wheel for Kivy-Garden
  Running setup.py clean for Kivy-Garden
Failed to build Kivy-Garden
Installing collected packages: chardet, idna, urllib3, certifi, requests, Kivy-Garden
  Running setup.py install for Kivy-Garden: started
    Running setup.py install for Kivy-Garden: finished with status 'done'
Successfully installed Kivy-Garden-0.1.1 certifi-2020.4.5.2 chardet-3.0.4 idna-2.9 requests-2.23.0 urllib3-1.25.9
# Create directory /home/musarra/Desktop/musarrapc/docs/pyproj/yfacereal/.buildozer/libs
# Install garden package graph in buildozer_dir
# Run 'garden install --app graph'
# Cwd /home/musarra/Desktop/musarrapc/docs/pyproj/yfacereal/.buildozer
Downloading http://github.com/kivy-garden/garden.graph/archive/master.zip ...
Traceback (most recent call last):
  File "/home/musarra/Desktop/musarrapc/docs/pyproj/yfacereal/.buildozer/venv/bin/garden", line 189, in <module>
    GardenTool().main(sys.argv[1:])
  File "/home/musarra/Desktop/musarrapc/docs/pyproj/yfacereal/.buildozer/venv/bin/garden", line 71, in main
    options.func()
  File "/home/musarra/Desktop/musarrapc/docs/pyproj/yfacereal/.buildozer/venv/bin/garden", line 109, in cmd_install
    fd = self.download(opts.package)
  File "/home/musarra/Desktop/musarrapc/docs/pyproj/yfacereal/.buildozer/venv/bin/garden", line 170, in download
    data += buf
TypeError: must be str, not bytes
# Command failed: garden install --app graph

When I leave

# (list) Garden requirements
#garden_requirements = graph,matplotlib

[INFO]:    Prebuilding kivy for arm64-v8a
[INFO]:    kivy has no prebuild_arm64_v8a, skipping
[INFO]:    Prebuilding matplotlib for arm64-v8a
[INFO]:    Downloading jquery-ui for matplatlib web backend
[INFO]:    Will download into /home/musarra/Desktop/musarrapc/docs/pyproj/yfacereal/.buildozer/android/platform/build-arm64-v8a/build/other_builds/matplotlib/arm64-v8a__ndk_target_21/matplotlib/p4a_files
[INFO]:    Downloading matplotlib from https://jqueryui.com/resources/download/jquery-ui-1.12.1.zip
Traceback (most recent call last):
  File "/usr/lib/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/usr/lib/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/home/musarra/Desktop/musarrapc/docs/pyproj/yfacereal/.buildozer/android/platform/python-for-android/pythonforandroid/toolchain.py", line 1259, in <module>
    main()
  File "/home/musarra/Desktop/musarrapc/docs/pyproj/yfacereal/.buildozer/android/platform/python-for-android/pythonforandroid/entrypoints.py", line 18, in main
    ToolchainCL()
  File "/home/musarra/Desktop/musarrapc/docs/pyproj/yfacereal/.buildozer/android/platform/python-for-android/pythonforandroid/toolchain.py", line 708, in __init__
    getattr(self, command)(args)
  File "/home/musarra/Desktop/musarrapc/docs/pyproj/yfacereal/.buildozer/android/platform/python-for-android/pythonforandroid/toolchain.py", line 153, in wrapper_func
    build_dist_from_args(ctx, dist, args)
  File "/home/musarra/Desktop/musarrapc/docs/pyproj/yfacereal/.buildozer/android/platform/python-for-android/pythonforandroid/toolchain.py", line 215, in build_dist_from_args
    args, "ignore_setup_py", False
  File "/home/musarra/Desktop/musarrapc/docs/pyproj/yfacereal/.buildozer/android/platform/python-for-android/pythonforandroid/build.py", line 569, in build_recipes
    recipe.prebuild_arch(arch)
  File "/home/musarra/Desktop/musarrapc/docs/pyproj/yfacereal/.buildozer/android/platform/python-for-android/pythonforandroid/recipes/matplotlib/__init__.py", line 104, in prebuild_arch
    self.download_web_backend_dependencies(arch)
  File "/home/musarra/Desktop/musarrapc/docs/pyproj/yfacereal/.buildozer/android/platform/python-for-android/pythonforandroid/recipes/matplotlib/__init__.py", line 93, in download_web_backend_dependencies
    self.download_file(url, target_file)
  File "/home/musarra/Desktop/musarrapc/docs/pyproj/yfacereal/.buildozer/android/platform/python-for-android/pythonforandroid/recipe.py", line 196, in download_file
    urlretrieve(url, target, report_hook)
  File "/usr/lib/python3.6/urllib/request.py", line 248, in urlretrieve
    with contextlib.closing(urlopen(url, data)) as fp:
  File "/usr/lib/python3.6/urllib/request.py", line 223, in urlopen
    return opener.open(url, data, timeout)
  File "/usr/lib/python3.6/urllib/request.py", line 532, in open
    response = meth(req, response)
  File "/usr/lib/python3.6/urllib/request.py", line 642, in http_response
    'http', request, response, code, msg, hdrs)
  File "/usr/lib/python3.6/urllib/request.py", line 570, in error
    return self._call_chain(*args)
  File "/usr/lib/python3.6/urllib/request.py", line 504, in _call_chain
    result = func(*args)
  File "/usr/lib/python3.6/urllib/request.py", line 650, in http_error_default
    raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 403: Forbidden
Download failed retrying in a second...Download failed retrying in a second...Download failed retrying in a second...Download failed retrying in a second...# Command failed: /usr/bin/python3 -m pythonforandroid.toolchain create --dist_name=ufaceapp --bootstrap=sdl2 --requirements=python3,kivy,numpy,matplotlib --arch arm64-v8a --copy-libs --color=always --storage-dir="/home/musarra/Desktop/musarrapc/docs/pyproj/yfacereal/.buildozer/android/platform/build-arm64-v8a" --ndk-api=21

Below my buildozer.spec.

[app]

# (str) Title of your application
title = Uface

# (str) Package name
package.name = ufaceapp

# (str) Package domain (needed for android/ios packaging)
package.domain = mmeng.org

# (str) Source code where the main.py live
source.dir = .

# (list) Source files to include (let empty to include all the files)
source.include_exts = py,png,jpg,kv,atlas, ttf

# (list) List of inclusions using pattern matching
#source.include_patterns = assets/*,images/*.png

# (list) Source files to exclude (let empty to not exclude anything)
#source.exclude_exts = spec

# (list) List of directory to exclude (let empty to not exclude anything)
#source.exclude_dirs = tests, bin

# (list) List of exclusions using pattern matching
#source.exclude_patterns = license,images/*/*.jpg

# (str) Application versioning (method 1)
version = 0.25

# (str) Application versioning (method 2)
# version.regex = __version__ = ['"](.*)['"]
# version.filename = %(source.dir)s/main.py

# (list) Application requirements
# comma separated e.g. requirements = sqlite3,kivy
requirements = python3,kivy,numpy,matplotlib

# (str) Custom source folders for requirements
# Sets custom source for any requirements with recipes
# requirements.source.kivy = ../../kivy

# (list) Garden requirements
garden_requirements = graph,matplotlib

# (str) Presplash of the application
#presplash.filename = %(source.dir)s/data/presplash.png

# (str) Icon of the application
icon.filename = t.png

# (str) Supported orientation (one of landscape, sensorLandscape, portrait or all)
#orientation = all

# (list) List of service to declare
#services = NAME:ENTRYPOINT_TO_PY,NAME2:ENTRYPOINT2_TO_PY

#
# OSX Specific
#

#
 author = Copyright © 2019 by Marcello Musarra

# change the major version of python used by the app
osx.python_version = 3

# Kivy version to use
osx.kivy_version = 1.11.1

#
# Android specific
#

# (bool) Indicate if the application should be fullscreen or not
fullscreen = 0

# (string) Presplash background color (for new android toolchain)
# Supported formats are: #RRGGBB #AARRGGBB or one of the following names:
# red, blue, green, black, white, gray, cyan, magenta, yellow, lightgray,
# darkgray, grey, lightgrey, darkgrey, aqua, fuchsia, lime, maroon, navy,
# olive, purple, silver, teal.
#android.presplash_color = #FFFFFF

# (list) Permissions
#android.permissions = INTERNET

# (int) Target Android API, should be as high as possible.
android.api = 28

# (int) Minimum API your APK will support.
#android.minapi = 21

# (int) Android SDK version to use
#android.sdk = 20

# (str) Android NDK version to use
#android.ndk = 19b

# (int) Android NDK API to use. This is the minimum API your app will support, it should usually match android.minapi.
#android.ndk_api = 21

# (bool) Use --private data storage (True) or --dir public storage (False)
#android.private_storage = True

# (str) Android NDK directory (if empty, it will be automatically downloaded.)
#android.ndk_path =

# (str) Android SDK directory (if empty, it will be automatically downloaded.)
#android.sdk_path =

# (str) ANT directory (if empty, it will be automatically downloaded.)
#android.ant_path =

# (bool) If True, then skip trying to update the Android sdk
# This can be useful to avoid excess Internet downloads or save time
# when an update is due and you just want to test/build your package
# android.skip_update = False

# (bool) If True, then automatically accept SDK license
# agreements. This is intended for automation only. If set to False,
# the default, you will be shown the license when first running
# buildozer.
# android.accept_sdk_license = False

# (str) Android entry point, default is ok for Kivy-based app
#android.entrypoint = org.renpy.android.PythonActivity

# (str) Android app theme, default is ok for Kivy-based app
# android.apptheme = "@android:style/Theme.NoTitleBar"

# (list) Pattern to whitelist for the whole project
#android.whitelist =

# (str) Path to a custom whitelist file
#android.whitelist_src =

# (str) Path to a custom blacklist file
#android.blacklist_src =

# (list) List of Java .jar files to add to the libs so that pyjnius can access
# their classes. Don't add jars that you do not need, since extra jars can slow
# down the build process. Allows wildcards matching, for example:
# OUYA-ODK/libs/*.jar
#android.add_jars = foo.jar,bar.jar,path/to/more/*.jar

# (list) List of Java files to add to the android project (can be java or a
# directory containing the files)
#android.add_src =

# (list) Android AAR archives to add (currently works only with sdl2_gradle
# bootstrap)
#android.add_aars =

# (list) Gradle dependencies to add (currently works only with sdl2_gradle
# bootstrap)
#android.gradle_dependencies =

# (list) add java compile options
# this can for example be necessary when importing certain java libraries using the 'android.gradle_dependencies' option
# see https://developer.android.com/studio/write/java8-support for further information
# android.add_compile_options = "sourceCompatibility = 1.8", "targetCompatibility = 1.8"

# (list) Gradle repositories to add {can be necessary for some android.gradle_dependencies}
# please enclose in double quotes
# e.g. android.gradle_repositories = "maven { url 'https://kotlin.bintray.com/ktor' }"
#android.add_gradle_repositories =

# (list) packaging options to add
# see https://google.github.io/android-gradle-dsl/current/com.android.build.gradle.internal.dsl.PackagingOptions.html
# can be necessary to solve conflicts in gradle_dependencies
# please enclose in double quotes
# e.g. android.add_packaging_options = "exclude 'META-INF/common.kotlin_module'", "exclude 'META-INF/*.kotlin_module'"
#android.add_gradle_repositories =

# (list) Java classes to add as activities to the manifest.
#android.add_activities = com.example.ExampleActivity

# (str) OUYA Console category. Should be one of GAME or APP
# If you leave this blank, OUYA support will not be enabled
#android.ouya.category = GAME

# (str) Filename of OUYA Console icon. It must be a 732x412 png image.
#android.ouya.icon.filename = %(source.dir)s/data/ouya_icon.png

# (str) XML file to include as an intent filters in <activity> tag
#android.manifest.intent_filters =

# (str) launchMode to set for the main activity
#android.manifest.launch_mode = standard

# (list) Android additional libraries to copy into libs/armeabi
#android.add_libs_armeabi = libs/android/*.so
#android.add_libs_armeabi_v7a = libs/android-v7/*.so
#android.add_libs_arm64_v8a = libs/android-v8/*.so
#android.add_libs_x86 = libs/android-x86/*.so
#android.add_libs_mips = libs/android-mips/*.so

# (bool) Indicate whether the screen should stay on
# Don't forget to add the WAKE_LOCK permission if you set this to True
#android.wakelock = False

# (list) Android application meta-data to set (key=value format)
#android.meta_data =

# (list) Android library project to add (will be added in the
# project.properties automatically.)
#android.library_references =

# (list) Android shared libraries which will be added to AndroidManifest.xml using <uses-library> tag
#android.uses_library =

# (str) Android logcat filters to use
#android.logcat_filters = *:S python:D

# (bool) Copy library instead of making a libpymodules.so
#android.copy_libs = 1

# (str) The Android arch to build for, choices: armeabi-v7a, arm64-v8a, x86, x86_64
android.arch = arm64-v8a

# (int) overrides automatic versionCode computation (used in build.gradle)
# this is not the same as app version and should only be edited if you know what you're doing
# android.numeric_version = 1

#
# Python for android (p4a) specific
#

# (str) python-for-android fork to use, defaults to upstream (kivy)
#p4a.fork = kivy

# (str) python-for-android branch to use, defaults to master
p4a.branch = develop

# (str) python-for-android git clone directory (if empty, it will be automatically cloned from github)
#p4a.source_dir =

# (str) The directory in which python-for-android should look for your own build recipes (if any)
#p4a.local_recipes =

# (str) Filename to the hook for p4a
#p4a.hook =

# (str) Bootstrap to use for android builds
# p4a.bootstrap = sdl2

# (int) port number to specify an explicit --port= p4a argument (eg for bootstrap flask)
#p4a.port =


#
# iOS specific
#

# (str) Path to a custom kivy-ios folder
#ios.kivy_ios_dir = ../kivy-ios
# Alternately, specify the URL and branch of a git checkout:
ios.kivy_ios_url = https://github.com/kivy/kivy-ios
ios.kivy_ios_branch = master

# Another platform dependency: ios-deploy
# Uncomment to use a custom checkout
#ios.ios_deploy_dir = ../ios_deploy
# Or specify URL and branch
ios.ios_deploy_url = https://github.com/phonegap/ios-deploy
ios.ios_deploy_branch = 1.7.0

# (str) Name of the certificate to use for signing the debug version
# Get a list of available identities: buildozer ios list_identities
#ios.codesign.debug = "iPhone Developer: <lastname> <firstname> (<hexstring>)"

# (str) Name of the certificate to use for signing the release version
#ios.codesign.release = %(ios.codesign.debug)s


[buildozer]

# (int) Log level (0 = error only, 1 = info, 2 = debug (with command output))
log_level = 2

# (int) Display warning if buildozer is run as root (0 = False, 1 = True)
warn_on_root = 1

# (str) Path to build artifact storage, absolute or relative to spec file
# build_dir = ./.buildozer

# (str) Path to build output (i.e. .apk, .ipa) storage
# bin_dir = ./bin

#    -----------------------------------------------------------------------------
#    List as sections
#
#    You can define all the "list" as [section:key].
#    Each line will be considered as a option to the list.
#    Let's take [app] / source.exclude_patterns.
#    Instead of doing:
#
#[app]
#source.exclude_patterns = license,data/audio/*.wav,data/images/original/*
#
#    This can be translated into:
#
#[app:source.exclude_patterns]
#license
#data/audio/*.wav
#data/images/original/*
#


#    -----------------------------------------------------------------------------
#    Profiles
#
#    You can extend section / key with a profile
#    For example, you want to deploy a demo version of your application without
#    HD content. You could first change the title to add "(demo)" in the name
#    and extend the excluded directories to remove the HD content.
#
#[app@demo]
#title = My Application (demo)
#
#[app:source.exclude_patterns@demo]
#images/hd/*
#
#    Then, invoke the command line with the "demo" profile:
#
#buildozer --profile demo android debug

[K leo]

Try set "android.permissions = INTERNET" in the spec file

[Marcello Musarra]

just did it, same errors....

[Robert Flatt]

The second one is:        sudo apt install libssl-dev

It is in the install instructions  https://buildozer.readthedocs.io/en/latest/installation.html

But is a recent change so perhaps nobody sent you the memo ;)

I'm not a garden user so I can't help with the other, but I know the structure of Garden changed a while back.

Check you are using a recent version of Buildozer.

[Marcello Musarra]

Hi Robert,

I have just done that and the same error persists.

I confirm that I have followed all procedures from https://buildozer.readthedocs.io/en/latest/installation.html for correct installation.

running the command sudo apt install libssl-dev, see the message below:

Reading package lists... Done
Building dependency tree      
Reading state information... Done
libssl-dev is already the newest version (1.1.1-1ubuntu2.1~18.04.6).
The following packages were automatically installed and are no longer required:
  linux-headers-4.15.0-101 linux-headers-4.15.0-101-generic
  linux-headers-4.15.0-99 linux-headers-4.15.0-99-generic
  linux-headers-5.3.0-46 linux-headers-5.3.0-46-generic linux-headers-5.3.0-51
  linux-headers-5.3.0-51-generic linux-image-4.15.0-101-generic
  linux-image-4.15.0-99-generic linux-image-5.3.0-46-generic
  linux-image-5.3.0-51-generic linux-modules-4.15.0-101-generic
  linux-modules-4.15.0-99-generic linux-modules-5.3.0-46-generic
  linux-modules-5.3.0-51-generic linux-modules-extra-4.15.0-101-generic
  linux-modules-extra-4.15.0-99-generic linux-modules-extra-5.3.0-46-generic
  linux-modules-extra-5.3.0-51-generic
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

when running

pip3 install --user --upgrade buildozer

Requirement already up-to-date: buildozer in ./.local/lib/python3.6/site-packages (1.2.0)
Requirement already satisfied, skipping upgrade: sh in /usr/local/lib/python3.6/dist-packages/sh-1.13.1-py3.6.egg (from buildozer) (1.13.1)
Requirement already satisfied, skipping upgrade: virtualenv in ./.local/lib/python3.6/site-packages (from buildozer) (20.0.22)
Requirement already satisfied, skipping upgrade: pexpect in /usr/lib/python3/dist-packages (from buildozer) (4.2.1)
Requirement already satisfied, skipping upgrade: six<2,>=1.9.0 in /usr/lib/python3/dist-packages (from virtualenv->buildozer) (1.11.0)
Requirement already satisfied, skipping upgrade: appdirs<2,>=1.4.3 in /usr/local/lib/python3.6/dist-packages/appdirs-1.4.4-py3.6.egg (from virtualenv->buildozer) (1.4.4)
Requirement already satisfied, skipping upgrade: filelock<4,>=3.0.0 in /usr/local/lib/python3.6/dist-packages/filelock-3.0.12-py3.6.egg (from virtualenv->buildozer) (3.0.12)
Requirement already satisfied, skipping upgrade: distlib<1,>=0.3.0 in /usr/local/lib/python3.6/dist-packages/distlib-0.3.0-py3.6.egg (from virtualenv->buildozer) (0.3.0)
Requirement already satisfied, skipping upgrade: importlib-metadata<2,>=0.12; python_version < "3.8" in ./.local/lib/python3.6/site-packages (from virtualenv->buildozer) (1.5.0)
Requirement already satisfied, skipping upgrade: importlib-resources>=1.0; python_version < "3.7" in /usr/local/lib/python3.6/dist-packages/importlib_resources-1.5.0-py3.6.egg (from virtualenv->buildozer) (1.5.0)
Requirement already satisfied, skipping upgrade: zipp>=0.5 in ./.local/lib/python3.6/site-packages (from importlib-metadata<2,>=0.12; python_version < "3.8"->virtualenv->buildozer) (2.2.0)

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[Robert Flatt]

As I said earlier I am not a Garden user, all I can do is suggest things to look at.

Buildozer is latest,  but Garden is from 2013     

Successfully installed Kivy-Garden-0.1.1

Don't know why that would be.

To work around buildozer/garden issues you could copy    graph  to your app source directory and  in the app import from there in place of importing via garden.

Also I wonder about matplotlib,  perhaps the recipe would be a better choice on Android?

Good luck.

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[Marcello Musarra]

Thanks for the idea, will try to clone from github graph and import from local to see if it works.

With respect to matplotlib, I did not understand what you meant. The app is indeed targetting android for now...

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[Robert Flatt]

I just wonder if the matplotlib recipe (so requirements) would be a better choice that the garden matplotlib

I dont know the answer to that question.

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[Marcello Musarra]

ok I see. Originally I set up the code this way because I thought there was no other way to use kivy with matplotlib backend FigureCanvasAgg, only through garden. But seems that things might have been updated. I'll check.

Get back soon. thanks 

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[Marcello Musarra]

Updates:

I managed to get rid of matplotlib and use just `graph` folder from my app root directory, it seemed to work.

However, trying to build the apk, other errors appeared as below...

I guess it is taking wrong architecture to build (buildozer spec - android.arch = arm64-v8a, no idea why) and not packaging as it should be.

# Check configuration tokens
# Ensure build layout
# Check configuration tokens
# Preparing build
# Check requirements for android
# Run 'dpkg --version'
# Cwd None
Debian 'dpkg' package management program version 1.19.0.5 (amd64).
This is free software; see the GNU General Public License version 2 or
later for copying conditions. There is NO warranty.
# Search for Git (git)
#  -> found at /usr/bin/git
# Search for Cython (cython)
#  -> found at /home/musarra/.local/bin/cython
# Search for Java compiler (javac)
#  -> found at /usr/lib/jvm/java-8-openjdk-amd64/bin/javac
# Search for Java keytool (keytool)
#  -> found at /usr/lib/jvm/java-11-openjdk-amd64/bin/keytool
# Install platform
# Run 'git config --get remote.origin.url'
# Cwd /home/musarra/Desktop/musarrapc/docs/pyproj/yfacereal/.buildozer/android/platform/python-for-android
https://github.com/kivy/python-for-android.git
# Run 'git branch -vv'
# Cwd /home/musarra/Desktop/musarrapc/docs/pyproj/yfacereal/.buildozer/android/platform/python-for-android
* develop 61be5d4c [origin/develop] Merge pull request #2236 from Swpolo/patch-1
# Run '/usr/bin/python3 -m pip install -q --user \'appdirs\' \'colorama>=0.3.3\' \'jinja2\' \'six\' \'enum34; python_version<"3.4"\' \'sh>=1.10; sys_platform!="nt"\' \'pep517<0.7.0"\' \'toml\''
# Cwd None
# Apache ANT found at /home/musarra/.buildozer/android/platform/apache-ant-1.9.4
# Android SDK found at /home/musarra/.buildozer/android/platform/android-sdk
# Recommended android's NDK version by p4a is: 19c
# Android NDK found at /home/musarra/.buildozer/android/platform/android-ndk-r19c
# Check application requirements
# Check garden requirements
# Compile platform
# Run '/usr/bin/python3 -m pythonforandroid.toolchain create --dist_name=ufaceapp --bootstrap=sdl2 --requirements=python3,kivy,numpy #,matplotlib --arch arm64-v8a --copy-libs --color=always --storage-dir="/home/musarra/Desktop/musarrapc/docs/pyproj/yfacereal/.buildozer/android/platform/build-arm64-v8a" --ndk-api=21'
# Cwd /home/musarra/Desktop/musarrapc/docs/pyproj/yfacereal/.buildozer/android/platform/python-for-android
[INFO]:    Will compile for the following archs: armeabi-v7a
[INFO]:    Found Android API target in $ANDROIDAPI: 28
[INFO]:    Available Android APIs are (27, 28)
[INFO]:    Requested API target 28 is available, continuing.
[INFO]:    Found NDK dir in $ANDROIDNDK: /home/musarra/.buildozer/android/platform/android-ndk-r19c
[INFO]:    Found NDK version 19c
[WARNING]: NDK API target was not set manually, using the default of 21 = min(android-api=28, default ndk-api=21)
[INFO]:    ccache is missing, the build will not be optimized in the future.
[INFO]:    Found the following toolchain versions: ['4.9']
[INFO]:    Picking the latest gcc toolchain, here 4.9
[INFO]:    Of the existing distributions, the following meet the given requirements:
[INFO]:     ufaceapp: min API 21, includes recipes (hostpython3, libffi, openssl, sdl2_image, sdl2_mixer, sdl2_ttf, sqlite3, python3, sdl2, setuptools, cython, six, numpy, pyjnius, android, kivy, certifi), built for archs (armeabi-v7a)
[INFO]:    ufaceapp has compatible recipes, using this one

# Package the application

Traceback (most recent call last):

  File "/home/musarra/.local/bin/buildozer", line 8, in <module>
    sys.exit(main())
  File "/home/musarra/.local/lib/python3.6/site-packages/buildozer/scripts/client.py", line 13, in main
    Buildozer().run_command(sys.argv[1:])
  File "/home/musarra/.local/lib/python3.6/site-packages/buildozer/__init__.py", line 1047, in run_command
    self.target.run_commands(args)
  File "/home/musarra/.local/lib/python3.6/site-packages/buildozer/target.py", line 92, in run_commands
    func(args)
  File "/home/musarra/.local/lib/python3.6/site-packages/buildozer/target.py", line 104, in cmd_debug
    self.buildozer.build()
  File "/home/musarra/.local/lib/python3.6/site-packages/buildozer/__init__.py", line 205, in build
    self.target.build_package()
  File "/home/musarra/.local/lib/python3.6/site-packages/buildozer/targets/android.py", line 1014, in build_package
    self._update_libraries_references(dist_dir)
  File "/home/musarra/.local/lib/python3.6/site-packages/buildozer/targets/android.py", line 1254, in _update_libraries_references
    with io.open(project_fn, 'w', encoding='utf-8') as fd:
FileNotFoundError: [Errno 2] No such file or directory: '/home/musarra/Desktop/musarrapc/docs/pyproj/yfacereal/.buildozer/android/platform/build-arm64-v8a/dists/ufaceapp__arm64-v8a/project.properties'

[Robert Flatt]

buildozer appclean

when switching from one processeor architecture to another

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[Marcello Musarra]

Ok, did it, but still same issue...I have also tried manually deletin bin and .buildozer folder....same issue

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[Robert Flatt]

no clue.

try recreating the .spec and changing nothing 

build

then step by step, make one change, clean, build, ........

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[Marcello Musarra]

got it, will try that.

Thanks Robert !

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