gradle sync error

Since I updated to android studio 3.0.1 I can not continue with my application. Gradle throws the following error: Gradle Sync Issues

  

Error: Unable to load class 'groovy.lang.GroovyObject' . Possible causes   for this unexpected error include:

• Gradle's dependency cache   may be corrupt (this sometimes occurs after a network connection   timeout.) Re-download dependencies and sync   project (requires network)
• 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)
• Your project may be using a third-party   plugin which is not compatible with the other plugins in the project   or the version of Grade requested by the project.

In the   case of corrupt Gradle processes, you can also try closing the IDE and   then killing all Java processes.

Any suggestions? Thank you very much.