Error upgrading

When I went to launch Parallels on my Mac laptop today, it wanted me to upgrade, so I did. Unfortunately I got this error:

"Make sure that prl_disp_service is running or check your firewall settings. If the problem persists, contact the Parallels support team for assistance."

I have no clue what to do. Can someone help?

 

I just needed to restart my computer to get Parallels to work. That would have been a helpful suggestion in the alert telling me that prl_disp_service is not running.