My license reactivate parallel desktop 10

I get this message "Your Product license has reached the activation limit".
Could you help me?

 

We have reset the activation key. Please follow the instructions below:
1. Quit Parallels Desktop, then try to activate after launching it again.
2. If you are still unable to activate, Open Terminal on the Mac and execute this command: prlsrvctl activate-license-online

Note: Parallels Desktop 10 is not compatible with Sierra or newer macOS X versions.