Article ID: 111656, created on Jul 18, 2011, last review on Aug 12, 2014

  • Applies to:
  • Virtuozzo hypervisor 4.0 for Mac


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:
Unable to load the Parallels driver. Restart the physical server and try again.

Before the upgrade, all virtual machines were working fine.


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.


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?

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