HELP! Fatal error: 'Flutter/Flutter.h' file not found #import <Flutter/Flutter.h> - iOS

[Alvaro Gonzalez Rico]

Hello! My app was working well until I came across the following issue: "Fatal error: 'Flutter/Flutter.h' file not found #import <Flutter/Flutter.h>" :

Launching lib/main.dart on iPhone 12 Pro Max in debug mode...

lib/main.dart:1

Xcode build done.                                            8.1s

Failed to build iOS app

Error output from Xcode build:

↳

    ** BUILD FAILED **

Xcode's output:

↳

    In file included from /Users/XnameX/Desktop/flutter/.pub-cache/hosted/pub.dartlang.org/path_provider-2.0.2/ios/Classes/FLTPathProviderPlugin.m:5:

    /Users/XnameX/Desktop/flutter/.pub-cache/hosted/pub.dartlang.org/path_provider-2.0.2/ios/Classes/FLTPathProviderPlugin.h:5:9: fatal error: 'Flutter/Flutter.h' file not found

    #import <Flutter/Flutter.h>

            ^~~~~~~~~~~~~~~~~~~

    1 error generated.

    note: Using new build system

    note: Building targets in parallel

    note: Planning build

    note: Analyzing workspace

    note: Constructing build description

    note: Build preparation complete

    note: Removed stale file '/Users/XnameX/Library/Developer/Xcode/DerivedData/Runner-cfjslqyzzdpnoyeoygvffcmbgtpq/Build/Products/Debug-iphonesimulator/sqflite/sqflite.framework'

Could not build the application for the simulator.

Error launching application on iPhone 12 Pro Max.

Exited (sigterm)

What can I do to resolve this? Thanks a lot in advance!

[Alvaro Gonzalez Rico]

After investigating the problem, the issue seems to come from 2 docs: "FLTPathProviderPlugin.h” (issue: “'Flutter/Flutter.h' file not found”) and “FLTPathProviderPlugin.m” (issue: “1. In file included from /Users/XnameX/Desktop/flutter/.pub-cache/hosted/pub.dartlang.org/path_provider-2.0.2/ios/Classes/FLTPathProviderPlugin.m:5:”). Something that I noticed is that the folder “.pub-cache” does NOT seem to be in Users/XnameX/Desktop/flutter when I look for it in my Finder. What could it be?