Sort File - Stopped On Exit 9.

I have a interface program that creates 2 CSV files one contains the payroll details and other the employee details. I am using sort files with input and output prodedures to create both files. payroll details is fine, but the employee file contains duplicates because of the sort fields in payroll file. I created another sort file to sort the employee file to remove dupliates. program compiles fine but I get this error message 

 ERROR:    Stopped On Exit 9.

Any suggestions welcome.