Oops!
It's not a right forum for this answer (or it's not a right answer for this forum).
I think, C5 error happens in destructor of object, created in main procedure.
Look in Call Stack window which destructor cause an error. You can also step INTO in debugger on exit from main().

>> Thank you for reply. Yes, I did debug it. C5 error occur when the program try to exit (no more code in main()). Any idea?