title: Flutter build error. Issue with flutter webview plugin
body: <p>I have added the flutter webview plugin but its causing problems. Its giving some error when building the project. I tried to delete the cache and rebuild the project but it didn't work.</p>
  
  <p>I just started learning flutter and can't find a solution to this problem. </p>
  
  <p>Below is the error I am getting.</p>
  
  <blockquote>
    <p>FAILURE: Build failed with an exception.</p>
    
    <ul>
    <li>What went wrong:
    Execution failed for task ':flutter_webview_plugin:compileDebugJavaWithJavac'.
    Unable to find source java class: 'C:\Users\personal\AppData\Roaming\Pub\Cache\hosted\pub.dartlang.org\flutter_webview_plugin-0.0.9+1\android\src\main\java\com\flutter_webview_plugin\WebviewActivity.java' because it does not belong to any of the source dirs: '[C:\Users\personal\AppData\Roaming\Pub\Cache\hosted\pub.dartlang.org\flutter_webview_plugin-0.1.5\android\src\main\java, C:\Users\personal\AppData\Roaming\Pub\Cache\hosted\pub.dartlang.org\flutter_webview_plugin-0.1.5\android\src\debug\java, C:\Users\personal\Documents\AndroidStudioProjects\flutter_newz\build\flutter_webview_plugin\generated\source\r\debug, C:\Users\personal\Documents\AndroidStudioProjects\flutter_newz\build\flutter_webview_plugin\generated\source\buildConfig\debug, C:\Users\personal\Documents\AndroidStudioProjects\flutter_newz\build\flutter_webview_plugin\generated\source\aidl\debug, C:\Users\personal\Documents\AndroidStudioProjects\flutter_newz\build\flutter_webview_plugin\generated\source\rs\debug]'</li>
    </ul>
    
    <p>BUILD FAILED in 54s
    Finished with error: Gradle build failed: 1</p>
  </blockquote>