Natural Engineer 6.1.1

I am using Extract & Load in Natural Engineer 6.1.1 and the JOB fails with the return code 255. I am getting the error “NATURAL Source Code (not found) Extract unsuccessful completion”. The job fails in step EXTRRUN. please help me in solving this error. If I am using the parameter DATSIZE=512, this will be solved, if so where I have to use this parameter.

I am submitting the job from Natural Engineer running in windows environment and connected to the mainframe.

Dear Sajeev,
Please dont use the forum to report problems. If you contact the
support via servline24, you will receive an answer immediately,
best regards Karlheinz