Symptoms
When you start Parallels Desktop, the following notification appears:
Parallels Desktop cannot be started because some of the required components are missing from the operating system of your Mac.

Cause
- Unsupported macOS version.
- Some essential macOS system utilities are missing or inaccessible.
Resolution
Note: This notification may appear if you are running older versions of Parallels Desktop on macOS 11 Big Sur. Visit the KB 125039 to find out more about Parallels Desktop and macOS 11 Big Sur compatibility.
- Install the latest Parallels Desktop for Mac product version using the links below:
- Reinstall macOS from macOS Recovery
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