Could not get unknown property 'flutter' for extension 'android' of type com.android.build.gradle.internal.dsl.BaseAppModuleExtension

Question

1. I treid uninstalling android studio and reinstalling latest version of android studio. 2. tried changing sdk version. 3.even tried changing dependy and what not it's been 2 days since i'm trying to solve this error. please help me to get over this

FAILURE: Build failed with an exception.

• Where: Build file 'C:\Users\91893\StudioProjects\kuk\android\app\build.gradle' line: 29

• What went wrong: A problem occurred evaluating project ':app'.

Could not get unknown property 'flutter' for extension 'android' of type com.android.build.gradle.internal.dsl.BaseAppModuleExtension.

• 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 1s Exception: Gradle task assembleDebug failed with exit code 1