while running code getting error

/C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/video_player_platform_interface-2.1.0/lib/messages.dart:143:13: Error: The method 'setMockMessageHandler' isn't defined for the class 'BasicMessageChannel'.
- 'BasicMessageChannel' is from 'package:flutter/src/services/platform_channel.dart' ('/C:/src/flutter/packages/flutter/lib/src/services/platform_channel.dart').
Try correcting the name to the name of an existing method, or defining a method named 'setMockMessageHandler'.
channel.setMockMessageHandler((dynamic message) async {
^^^^^^^^^^^^^^^^^^^^^
/C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/video_player_platform_interface-2.1.0/lib/messages.dart:151:13: Error: The method 'setMockMessageHandler' isn't defined for the class 'BasicMessageChannel'.
- 'BasicMessageChannel' is from 'package:flutter/src/services/platform_channel.dart' ('/C:/src/flutter/packages/flutter/lib/src/services/platform_channel.dart').
Try correcting the name to the name of an existing method, or defining a method named 'setMockMessageHandler'.
channel.setMockMessageHandler((dynamic message) async {
^^^^^^^^^^^^^^^^^^^^^
/C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/video_player_platform_interface-2.1.0/lib/messages.dart:161:13: Error: The method 'setMockMessageHandler' isn't defined for the class 'BasicMessageChannel'.
- 'BasicMessageChannel' is from 'package:flutter/src/services/platform_channel.dart' ('/C:/src/flutter/packages/flutter/lib/src/services/platform_channel.dart').
Try correcting the name to the name of an existing method, or defining a method named 'setMockMessageHandler'.
channel.setMockMessageHandler((dynamic message) async {
^^^^^^^^^^^^^^^^^^^^^
/C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/video_player_platform_interface-2.1.0/lib/messages.dart:171:13: Error: The method 'setMockMessageHandler' isn't defined for the class 'BasicMessageChannel'.
- 'BasicMessageChannel' is from 'package:flutter/src/services/platform_channel.dart' ('/C:/src/flutter/packages/flutter/lib/src/services/platform_channel.dart').
Try correcting the name to the name of an existing method, or defining a method named 'setMockMessageHandler'.
channel.setMockMessageHandler((dynamic message) async {
^^^^^^^^^^^^^^^^^^^^^
/C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/video_player_platform_interface-2.1.0/lib/messages.dart:181:13: Error: The method 'setMockMessageHandler' isn't defined for the class 'BasicMessageChannel'.
- 'BasicMessageChannel' is from 'package:flutter/src/services/platform_channel.dart' ('/C:/src/flutter/packages/flutter/lib/src/services/platform_channel.dart').
Try correcting the name to the name of an existing method, or defining a method named 'setMockMessageHandler'.
channel.setMockMessageHandler((dynamic message) async {
^^^^^^^^^^^^^^^^^^^^^
/C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/video_player_platform_interface-2.1.0/lib/messages.dart:191:13: Error: The method 'setMockMessageHandler' isn't defined for the class 'BasicMessageChannel'.
- 'BasicMessageChannel' is from 'package:flutter/src/services/platform_channel.dart' ('/C:/src/flutter/packages/flutter/lib/src/services/platform_channel.dart').
Try correcting the name to the name of an existing method, or defining a method named 'setMockMessageHandler'.
channel.setMockMessageHandler((dynamic message) async {
^^^^^^^^^^^^^^^^^^^^^
/C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/video_player_platform_interface-2.1.0/lib/messages.dart:201:13: Error: The method 'setMockMessageHandler' isn't defined for the class 'BasicMessageChannel'.
- 'BasicMessageChannel' is from 'package:flutter/src/services/platform_channel.dart' ('/C:/src/flutter/packages/flutter/lib/src/services/platform_channel.dart').
Try correcting the name to the name of an existing method, or defining a method named 'setMockMessageHandler'.
channel.setMockMessageHandler((dynamic message) async {
^^^^^^^^^^^^^^^^^^^^^
/C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/video_player_platform_interface-2.1.0/lib/messages.dart:211:13: Error: The method 'setMockMessageHandler' isn't defined for the class 'BasicMessageChannel'.
- 'BasicMessageChannel' is from 'package:flutter/src/services/platform_channel.dart' ('/C:/src/flutter/packages/flutter/lib/src/services/platform_channel.dart').
Try correcting the name to the name of an existing method, or defining a method named 'setMockMessageHandler'.
channel.setMockMessageHandler((dynamic message) async {
^^^^^^^^^^^^^^^^^^^^^
/C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/video_player_platform_interface-2.1.0/lib/messages.dart:221:13: Error: The method 'setMockMessageHandler' isn't defined for the class 'BasicMessageChannel'.
- 'BasicMessageChannel' is from 'package:flutter/src/services/platform_channel.dart' ('/C:/src/flutter/packages/flutter/lib/src/services/platform_channel.dart').
Try correcting the name to the name of an existing method, or defining a method named 'setMockMessageHandler'.
channel.setMockMessageHandler((dynamic message) async {
^^^^^^^^^^^^^^^^^^^^^

FAILURE: Build failed with an exception.

* Where:
Script 'C:\src\flutter\packages\flutter_tools\gradle\flutter.gradle' line: 1005

* What went wrong:
Execution failed for task ':app:compileFlutterBuildDebug'.
> Process 'command 'C:\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 58s
Exception: Gradle task assembleDebug failed with exit code 1

Start with the reported errors in video_player_platform_interface-2.1.0/lib/messages.dart and compare the referenced BasicMessageChannel API in Flutter's platform_channel.dart. Check the build failure at packages/flutter_tools/gradle/flutter.gradle line 1005, then verify the project builds successfully without the setMockMessageHandler errors.

Written by the indexing model from the issue text.