getting error while launching

lib/main.dart:2:8: Error: Error when reading 'lib/example.dart': The system cannot find the file specified.

import 'package:flutter_to_wed/example.dart' as example;
^
lib/main.dart:28:13: Error: Method not found: 'GeneratedWidget'.
body: example.GeneratedWidget(),
^^^^^^^^^^^^^^^

FAILURE: Build failed with an exception.

* Where:
Script 'D:\Applications\Flutter_src\flutter\packages\flutter_tools\gradle\flutter.gradle' line: 1035

* What went wrong:
Execution failed for task ':app:compileFlutterBuildDebug'.
> Process 'command 'D:\Applications\Flutter_src\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 48s
Exception: Gradle task assembleDebug failed with exit code 1

Start with lib/main.dart and the referenced lib/example.dart path, then inspect how this repository generates Flutter widgets from JSON. Confirm why example.dart and GeneratedWidget are unavailable; done means the example builds without the reported missing-file and unresolved-method errors.

Written by the indexing model from the issue text.