You get the following error when performing some actions in Parallels Desktop:
The operation cannot be performed at the moment.
The error message indicates that there is not enough free RAM in Mac OS for Parallels Desktop to function properly.
Quit other applications running on the Mac.
- Install more RAM to your Mac.
NOTE: In case your virtual machine does not respond after the error massage stated above, you may Force Quit it from the Actions menu -> Stop on the Mac menu bar.