Parallels 11 "error message" at startup (Mac El Capitan Beta and Windows 10)

Whenever I start up Parallels 11 (running on the El Capitan Gold Master and Windows 10), whether I am starting Windows from a suspended state or a full startup (after a full shutdown instead of Windows 10 going into suspend mode), I get an message box that a "critical error" has occurred. The first time I ignored it as everything seemed to be working fine. The next two times I wrote in the little box "got this error message but everything is running fine". Got it box today and just clicked cancel. (Sorry did not write down the report numbers - again everything seems to be working fine.)
Anyone have this experience or any ideas of what is going on?
Thanks, Steve Wandy

FOLLOWUP: Just got the error message again - Report #75017570. This time it was while Windows 10 was actually up and running.

 

Hello Swandy,
Please try creating empty virtual machine and map the existing hard drive and check for the error, please refer to http://kb.parallels.com/121578 to learn more.

 

Ok Manu. I followed your instructions (in the link above) and same thing happened - this time with the Windows 10 install just sitting around doing nothing. The report number was 75454342.

 

Any thoughts Manu - because in order to continue with the newer install of Windows 10, I have to contact Microsoft (possibly others) in order to de-authorize my original installs of MS Office 2013 and have it re-authorized for the new machine.