Erik,
In my experience a problem such as this is usually related to permissions on the computer where Vugen is located. I would make sure your user account has full permissions to the particular file in question, and also that you are running Vugen as an administrator. I recently ran into a Access Violation error and this was the case, it was with creating a results directory through the Controller however, but I believe it will remain true in this case as well.
Thanks,
Nicholas Pruett