I've hit that message too on earlier Service Packs of EPDM 2014. For 2014 there is a hotfix available to solve this issue.
Any idea what SP this might be included in? I have SP4 installed and seem to have a similar problem.
Further investigation with my problem has revealed its actually an Autodesk Inventor View error message. This error message occurs 100% of the time when attempting to preview Inventor Presentation files (IPN) from within EPDM (Explorer). Weird, same preview works fine for (Inventor) parts and assemblies.
EPDM seems to retrieve all the pertinent files, just appears Inventor View is not happy with them. I checked-out the files to verify the obvious read-only flag as being a potential problem, but to no avail.
I'll have to dig around some more and see if its just my presentation files (*.IPN) EPDM is not happy with, or all presentation files.
Wanted to create this post to clarify my specific issue.
EPDM 2014 SP4
I actually still get this message in EPDM 2015.
Did you update to 2015 SP0 at some point? If so you'll have to apply S-067254 to fix that error
I did. I'll give it a shot.
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