Clipper Summer 87 Question

Dear ALL
My Company insurance software using clipper Summer 87 made. So i do some modify after re-open show error message as “DBFNTX/1003 open error CURICODE.NTX (open error 4),I have click default with show DBFNTX/1003 open erroe ISDPRN.DBF Open error (Dos error 4). I have click quick with show DBCMB/2001 ORD21STADD. Anybody have help me solve this problems and give suggest or solution to me with fix it this problems.

Regards
Jackie Wong