Unable to open .vmdk file. One of the disks in this virtual machine is already in use by a virtual machine or by a snapshot

Hi,

when i try to open Vm with win 2008srv on workstation 10 i got the message "unable to Unable to open .vmdk file. One of the disks in this virtual machine is already in use by a virtual machine or by a snapshot."

even a log file isn't created. I cannot revert to he snapshot.

Anybody can help me? Any suggestion? I need to recover this Vm

Thanks in advance