WHEN YOUR TRY SUBMIT FILE WITH( pre populate fields by previous submission) A SERVER ERROR HAS OCCURRED - ERROR 500.  

Is this a competition entry or a normal entry? Pre populate doesn't work for competition entries using the submit button specific to each benchmark stage. The only time you can pre populate and get a score into a comp is when you get a competition pop up after you've entered a score with the main submit button in the normal way. Team Cup doesn't apparently have the popup function enabled. 

Is it the same error as described here? If it is, it has already been reported to the developers.

Thank You for info 

That error still exists