Invalid PGP Virtual Disk

I created a virtual encrypted disk a few months ago. I mounted and used the disk a couple of weeks ago.  Today, I unsuccessfully mounted the disk.  I received the following error message.

Invalid PGP Virtual Disk: The specified disk doesn't appear to be a valid legacy PGP Virtual Disk. 

Is there any way to recover this disk?  I have important data stored and at a lost right now.

Thanks.

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