Flutter : The getter 'Pestawait' isn't defined for the class 'RetryOptions' - flutter

Question

I try to implement an app. And I run it several times with no errors. But without any reason, and after a day I try to run my app, I got the below error, and I try to find a solution for id but I did not find anything.
So can someone provide me how can I solve it?
Launching lib\main.dart on sdk gphone x86 in debug mode...
lib\main.dart
../../../flutter/flutter/.pub-cache/hosted/pub.dartlang.org/retry-3.0.1/lib/retry.dart:131:16: Error: Expected ';' after this.
return Pestawait fn();
^^^^^^^^^
../../../flutter/flutter/.pub-cache/hosted/pub.dartlang.org/retry-3.0.1/lib/retry.dart:131:16: Error: The getter 'Pestawait' isn't defined for the class 'RetryOptions'.
- 'RetryOptions' is from 'package:retry/retry.dart' ('../../../flutter/flutter/.pub-cache/hosted/pub.dartlang.org/retry-3.0.1/lib/retry.dart').
Try correcting the name to the name of an existing getter, or defining a getter or field named 'Pestawait'.
return Pestawait fn();
^^^^^^^^^
../../../flutter/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_datetime_picker-1.4.0/lib/flutter_datetime_picker.dart:215:48: Error: No named parameter with the name 'shadowThemeOnly'.
ThemeData inheritTheme = Theme.of(context, shadowThemeOnly: true);
^^^^^^^^^^^^^^^
../../../flutter/flutter/packages/flutter/lib/src/material/theme.dart:119:20: Context: Found this candidate, but the arguments don't match.
static ThemeData of(BuildContext context) {
^^
FAILURE: Build failed with an exception.
* Where:
Script 'D:\mohy\flutter\flutter\packages\flutter_tools\gradle\flutter.gradle' line: 900
* What went wrong:
Execution failed for task ':app:compileFlutterBuildDebug'.
> Process 'command 'D:\mohy\flutter\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 9m 1s
Exception: Gradle task assembleDebug failed with exit code 1
Exited (sigterm)

Answer 1

It seems your library is broken. You can delete that folder and install that package again. Or for a quick fix, you can change that part in the related file as in here.
Future<T> retry<T>(
FutureOr<T> Function() fn, {
FutureOr<bool> Function(Exception)? retryIf,
FutureOr<void> Function(Exception)? onRetry,
}) async {
var attempt = 0;
// ignore: literal_only_boolean_expressions
while (true) {
attempt++; // first invocation is the first attempt
try {
return await fn(); // Here is broken!
} on Exception catch (e) {
if (attempt >= maxAttempts ||
(retryIf != null && !(await retryIf(e)))) {
rethrow;
}
if (onRetry != null) {
await onRetry(e);
}
}
// Sleep for a delay
await Future.delayed(delay(attempt));
}
}
}