flutter start fails with Incompatible sky_engine package error message

[Shakeel Mahate]

flutter start returns the following error message

Error: incompatible sky_engine package; please run 'pub get' to get the correct one.

pub get returns the following

Resolving dependencies... 

Got dependencies!

flutter --version

Flutter from https://github.com/flutter/flutter.git (on alpha)

flutter revision: 1328562e11a4c685bd6de0873b78a5057f6e94c5 (3 days ago)

engine revision : 3f1bde71969d9da119767e479e11fc22948e3bc2

This error is true for all flutter apps, even the examples folder

Please help

[Paul Beusterien]

I ran into the same problem yesterday and it was solved thanks to Hixie_ on the irc channel recommending running dev/update-packages.dart

[Shakeel Mahate]

Here's how to fix this problem

$ cd <to-where-you-installed-flutter> # cd ~/flutter

$ dev/update_packages.dart # It updated 19 packages for me

dev/update_packages.dart 

Updating /Users/shakeel/flutter/packages/cassowary... (9040 ms)

Updating /Users/shakeel/flutter/packages/flutter... (10266 ms)

Updating /Users/shakeel/flutter/packages/flutter_sprites... (13533 ms)

Updating /Users/shakeel/flutter/packages/flutter_test... (9686 ms)

Updating /Users/shakeel/flutter/packages/flutter_tools... (2043 ms)

Updating /Users/shakeel/flutter/packages/flx... (7612 ms)

Updating /Users/shakeel/flutter/packages/gcm... (7481 ms)

Updating /Users/shakeel/flutter/packages/newton... (7909 ms)

Updating /Users/shakeel/flutter/packages/playfair... (9353 ms)

Updating /Users/shakeel/flutter/packages/updater... (7293 ms)

Updating /Users/shakeel/flutter/examples/address_book... (1399 ms)

Updating /Users/shakeel/flutter/examples/fitness... (7403 ms)

Updating /Users/shakeel/flutter/examples/hello_world... (6849 ms)

Updating /Users/shakeel/flutter/examples/material_gallery... (11758 ms)

Updating /Users/shakeel/flutter/examples/mine_digger... (6472 ms)

Updating /Users/shakeel/flutter/examples/raw... (6353 ms)

Updating /Users/shakeel/flutter/examples/rendering... (6832 ms)

Updating /Users/shakeel/flutter/examples/stocks... (727 ms)

Updating /Users/shakeel/flutter/examples/widgets... (1437 ms)

Ran "pub get" 19 times in 133469 ms

$ cd flutter-app-project

$ flutter start

flutter start

Downloading darwin-x64 artifacts from the cloud, one moment please...

Downloading android-arm artifacts from the cloud, one moment please...

Downloading https://storage.googleapis.com/mojo_infra/flutter/3f1bde71969d9da119767e479e11fc22948e3bc2/darwin-x64/artifacts.zip.

Downloading https://storage.googleapis.com/mojo_infra/flutter/3f1bde71969d9da119767e479e11fc22948e3bc2/android-arm/artifacts.zip.

Can not locate Resources: Directory: 'apk/res', ignoring.

Building APK...

Signing the APK using the debug keystore.

Generated APK to build/app.apk.

Starting lib/main.dart on Nexus 6...

Installing app.apk on device.

The app now installs on device and runs. Strange, the behaviour of flutter start changed, even though flutter --version says it is three days old.

flutter --version

Flutter from https://github.com/flutter/flutter.git (on alpha)

flutter revision: 1328562e11a4c685bd6de0873b78a5057f6e94c5 (3 days ago)

engine revision : 3f1bde71969d9da119767e479e11fc22948e3bc2

Looks the tooling is being updated and there are some growing pains.

[Seth Ladd]

Hi Shakeel,

Any chance you could try the master branch of flutter?

cd flutter_dir

git checkout master

git pull

cd project_dir

flutter upgrade

Thanks!

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[Shakeel Mahate]

Hi Seth

Adam Barth just patched Alpha branch and made some changes to master to remove FLUTTER_DEV https://github.com/flutter/flutter/pull/1734

So before I checked out master, I did a flutter upgrade on my app and it pulled code from git and did pub get and updates flutter tools etc.

So when I did git checkout master and git pull, git reported that I was already up-to-date. So right now flutter upgrade works even with the master branch for me.

The minimal app with FAB event handler now shows a sash on the top left hand corner, but it is obscured by the Android icon bar. It show "Slow Mode" maybe.

Thanks

Shakeel

[Seth Ladd]

On Tue, Feb 9, 2016 at 2:41 PM, Shakeel Mahate <shakeel...@gmail.com> wrote:

Hi Seth

Adam Barth just patched Alpha branch and made some changes to master to remove FLUTTER_DEV https://github.com/flutter/flutter/pull/1734

So before I checked out master, I did a flutter upgrade on my app and it pulled code from git and did pub get and updates flutter tools etc.

So when I did git checkout master and git pull, git reported that I was already up-to-date. So right now flutter upgrade works even with the master branch for me.

The minimal app with FAB event handler now shows a sash on the top left hand corner, but it is obscured by the Android icon bar. It show "Slow Mode" maybe.

Ah, you noticed :) We added this because we had a few partners ask us why their app was slow, and turned out they were running in checked mode, which runs all the asserts which do quite a lot. So, now it's pretty clear if your app is in dev/checked/slow mode :)

 

To view this discussion on the web visit https://groups.google.com/d/msgid/flutter-dev/335e8bc0-d997-46f0-8196-25e27804428f%40googlegroups.com.

[Eric Seidel]

You can run your app with `flutter start --no-checked` to be out of
"slow mode". Checked mode is *much* better for development however.
Just don't expect checked mode to hit 60fps all the time. :)

> https://groups.google.com/d/msgid/flutter-dev/CACr%3D8_PWKbE2iaZmYAOsR%2B3GwWp3uqY0KRcsf%2BzqAmVXaMutnw%40mail.gmail.com.