Please try uninstalling and installing Parallels Desktop:
1. Open Terminal.app on the Mac.
2. Proceed with executing the commands below one by one:
sudo rm -rfd /System/Library/Extensions/prl
sudo rm -rfd ~/Library/Preferences/com.parallels
sudo rm -rfd /Library/Preferences/parallels
sudo rm -rfd /Library/Parallels
sudo rm -rfd ~/Library/Saved\ Application\ State/com.parallels.desktop.console.savedState
sudo rm -rfd /Library/logs/parallels.log
sudo rm -rfd /Library/Preferences/Parallels/
sudo rm -rfd /Private/var/db/parallels
sudo rm -rfd /Private/var/.parallels_swap
sudo rm -rfd /Private/var/db/receipts/'com.parallels*'
sudo rm -rfd /Private/var/db/Parallels/Stats
sudo rm -rfd /Private/var/root/library/preferences/com.parallels.desktop.plist
sudo rm -rfd ~/Applications\ \(Parallels\)/
sudo rm -rfd /Applications/Parallels\ Desktop.app
After that, please try to install
Parallels Desktop 12.
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