This is a Quickbooks problem, not a problem I need to diagnose for you.  There's plenty of info in this thread alone that you need to get your developers on this quickly.  The error is a fatal error which causes data corruption.  Please don't continue to pacify every post in this thread with the same useless copy and pasted suggestions.  They don't work.  This issue must be moved to a higher level support that can actually do the technical troubleshooting.