This isn't a crash technically... You are already closing your AutoCAD Vertical session when this comes up. From a few threads that I have read, basically your session is holding onto an AEC module during the exit process, and the session isn't releasing it properly as it closes.
This is a very harmless error. Some have claimed that it is due to installing 2013. I disagree since I get the error and have never installed 2013! Some have reported that a repair of 2012 pruducts fixes the error. Again not my experience.
Here are some of the threads...
DON"T LOAD 2013
Best Error Message Ever
Unknown error on Shutdown
C3D2012 is giving me the silent treatment
The last thread gives what I think is the best plausible reason for the error, see Peter Funk's reply no 11. ~ Mary
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Normal people believe that if it ain't broke, don't fix it.
Software Engineers believe that if it ain't broke, it doesn't have enough features yet.
