title: Unable to load class 'groovy.lang.GroovyObject'
body: <p>since I upgraded to android studio 3.0.1 I can not continue with my application. Gradle throws the following error: Gradle Sync Issues</p>
  
  <blockquote>
    <p><strong>Error: Unable to load class 'groovy.lang.GroovyObject'.</strong> Possible causes for this unexpected error include:  <li> Gradle's
    dependency cache may be corrupt (this happens after a network
    connection timeout.)  Re-download dependencies
    and sync project (requires network)   <li> The state of a
    Gradle build process (daemon) may be corrupt. Stopping all Gradle
    daemons may solve this problem.  Stop
    Gradle build processes (requires restart)   <li> Your
    project may be using a third-party plugin which is not compatible with
    the other plugins in the project or the Grade requested by the
    project.   In the case of corrupt Gradle processes, you
    can also try to close the IDE and then killing all Java processes.</p>
  </blockquote>
  
  <p>Any suggestions? Thank you very much.</p>