I/O error : file 'SORTWK3'

hi,

I run cobol program with net-express 5.1 wp 16 (work fine in mainframe and Enterpise developer.)

but on my net express project I have this error:

I/O error : file 'SORTWK3'
error code: 3/5 (ANS85), pc=0, call=1, seg=0
13 File not found

Can I solve with compiler directive or other?

thanks

bye