APcheck can't be modified - Load report failed

I can not longer confidently modify AP check form.   When I make modifications i get the Cyrstal reports error:    load report failed.  If i put the original back in place it prints fine.  If i simply open the form don't make any changes and save it again I get the cyrstal report error also.

They are running V2018.  

I am modifying the form with CR professional 11.5