The method 'FlatButton' isn't defined for the class 'PagewiseState<T>'.

[thaliashospitality]

Running Gradle task 'assembleDebug'...
../../../development/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_pagewise-2.0.1/lib/flutter_pagewise.dart:312:30: Error: The method 'FlatButton' isn't defined for the class 'PagewiseState<T>'.
 - 'PagewiseState' is from 'package:flutter_pagewise/flutter_pagewise.dart' ('../../../development/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_pagewise-2.0.1/lib/flutter_pagewise.dart').
Try correcting the name to the name of an existing method, or defining a method named 'FlatButton'.
    var defaultRetryButton = FlatButton(
                             ^^^^^^^^^^


FAILURE: Build failed with an exception.

* Where:
Script '/Users/programmer/development/flutter/packages/flutter_tools/gradle/flutter.gradle' line: 1159

* What went wrong:
Execution failed for task ':app:compileFlutterBuildDebug'.
> Process 'command '/Users/programmer/development/flutter/bin/flutter'' 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 36s
Exception: Gradle task assembleDebug failed with exit code 1