ProTools 12 Open Session Assertion error

I just installed ProTools 12 and every time I open a session, it errors out and displays the following message:

Could not complete the Open Session... command because Assertion in "..\ ..\ Sys\ Win32\ Sys_VolumeWin32.cpp", line 237.


If I load the same session with ProTools 10, the session is just fine. Any idea how to resolve this issue.

Thanks