Every time I attempt to efile a client return in Pro Series Basic, I get the following result: Form 1040 Individual. Not transmitted, the selected return(s) was not successfully converted for Electronic Filing. Open the return(s), correct any errors in Final Review, save the return(s) and re-convert for Electronic Filing.

I have updated the software several times in an attempt to fix any problems. 

Final Review shows no errors to be fixed.

HELP!!!