functional_widget - flutter build apk

build.log

C:\Users\Pavel\AndroidStudioProjects\test_functional_widget>flutter build apk
You are building a fat APK that includes binaries for android-arm, android-arm64.
If you are deploying the app to the Play Store, it's recommended to use app bundles or split the APK to reduce the APK
size.
    To generate an app bundle, run:
        flutter build appbundle --target-platform android-arm,android-arm64
        Learn more on: https://developer.android.com/guide/app-bundle
    To split the APKs per ABI, run:
        flutter build apk --target-platform android-arm,android-arm64 --split-per-abi
        Learn more on:  https://developer.android.com/studio/build/configure-apk-splits#configure-abi-split
Initializing gradle...                                              1,0s
Resolving dependencies...                                           4,1s
starting build daemon...                                            1,3s

Compiler message:
org-dartlang-app:/main.dart:23:16: Error: Method not found: 'Foo'.
        child: Foo(42),
               ^^^
org-dartlang-app:/main.dart:23:16: Error: The method 'Foo' isn't defined for the class 'MyHomePage'.
 - 'MyHomePage' is from 'package:test_functional_widget/main.dart' ('org-dartlang-app:/main.dart').
Try correcting the name to the name of an existing method, or defining a method named 'Foo'.
        child: Foo(42),
               ^^^
Compiler terminated unexpectedly.

FAILURE: Build failed with an exception.

* Where:
Script 'C:\flutterSdk\flutter\packages\flutter_tools\gradle\flutter.gradle' line: 739

* What went wrong:
Execution failed for task ':app:compileFlutterBuildReleaseArm'.
> Process 'command 'C:\flutterSdk\flutter\bin\flutter.bat'' finished with non-zero exit value 1

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 13s
Running Gradle task 'assembleRelease'...
Running Gradle task 'assembleRelease'... Done                      13,8s
Gradle task assembleRelease failed with exit code 1

C:\Users\Pavel\AndroidStudioProjects\test_functional_widget>