I've had a number of Iso's that failed giving this error (along with a 33,700 message - that isn't listed in the Isodraft Errors section of the manual BTW Aveva).
Examining the error file there were an excessively large number of SKEY errors.
One of our C&S guys has for unknown reasons changed a large number of WN Flange SKEYS to RP's and PDMS would appear not to like excessive number of this type of error on a given PIPE.
Fixed a number of the SKEYS and the Isometric started running again.
I've found it quite useful when getting an error where the cause is unclear to work on clearing the errors you can see. If nothing else it clears your mind and lets you think around the problem and at best you stumble across the fix.
My beef with this is more that it doesn't actually tell you that much (and certainly with my error I couldn't see any relevance between the error message and the problem) and isn't listed in the IsoDraft reference with all of the other 33 and 35 error codes and their brief description to help you sort it out.
Another one is the PNS error, it's great now that I understand it to be a 'Priviledges Not Sufficient' error, but would it have been that hard for Aveva to actually have the error box say that or alternate wording to suggest that a particular file can't be written to a given location and that the users access rights may be insufficient?
