If you have determined that the problem lies in one of the I/O procedures in your program, you can include the USE EXCEPTION/ERROR declarative to help debug the problem. If the file does not open, the appropriate USE EXCEPTION/ERROR declarative is activated. You can specify the appropriate declarative for the file or for the different open attributes: INPUT, OUTPUT, I/O, or EXTEND. Code each USE AFTER STANDARD ERROR statement in a separate section immediately after the Declarative Section keyword of the Procedure Division.