Flutter Execution failed for task ':file_picker:compileDebugJavaWithJavac'

/Users/mycomputer/.pub-cache/hosted/pub.dev/file_picker-8.1.5/android/src/main/java/com/mr/flutter/plugin/filepicker/FilePickerPlugin.java:257: error: cannot find symbol
    if (registrar != null) {
        ^
   symbol:   variable registrar
   location: class FilePickerPlugin
   /Users/mycomputer/.pub-cache/hosted/pub.dev/file_picker-8.1.5/android/src/main/java/com/mr/flutter/plugin/filepicker/FilePickerPlugin.java:260: error: cannot find symbol
          registrar.addActivityResultListener(this.delegate);
          ^
  symbol:   variable registrar
  location: class FilePickerPlugin
 2 errors

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task 

‘:file_picker:compileDebugJavaWithJavac’.

Compilation failed; see the compiler error output for details.

I’m getting the error with file_picker plugin, i have also delete the .gradle file but not getting help. I have also change the file_picker version but not getting help.

Thanks in advanced.