Encountered an error while parsing

Hello,
I have copied all of the new policy files to my admx policy store. When I open up a GPQ to edit it, I get the following error message. I found some reviews on the forum but can’t find proper resolution. Would you please help me? Thanks.

Administrative Templates:
Encountered an error while parsing.
Namespace.
'access14.Office.Microsoft.Policies.Windows'is already defined as the target namespace for another file in the store.
File:
\…..comsysvol….access15.admax,line4,column87
