APPLIES TO:

Symptoms

I have Parallels Server 4.0 for Mac installed on my server. After upgrading the host operating system to Mac OS X 10.7 Lion, I am unable to start any of my virtual machines. Parallels Management Console shows this error:


Before the upgrade, all virtual machines were working fine.

Cause

The build of Parallels Server 4.0 for Mac currently installed on the server does not support Mac OS X 10.7 Lion as the host operating system.

Resolution

To resolve the issue, upgrade Parallels Server 4.0 for Mac to the latest build available:
111601 How do I obtain the latest build of Parallels Server for Mac?

IMPORTANT NOTE: For both Desktop for Mac and Server for Mac, our current support for Lion is limited to being able to run our products on a Lion host operating system. Future versions will include support for Lion-specific features.

Additional Information

For more information about Mac OS X 10.7 Lion support, refer to these articles:
111620 Is Mac OS X 10.7 Lion supported by Parallels Server 4.0 for Mac?
111583 Is Mac OS X 10.7 Lion supported by Parallels Server?