ارور هنگام نصب پکیج webview در فلاتر

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FAILURE: Build failed with an exception.

• Where:
  Build file 'C:\Users\user1\AndroidStudioProjects\biographi\android\app\build.gradle' line: 47

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

  Cannot get property '20' on null object

• 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