OP7 error..

Hi all,
I am useing Protool and Step 7 and i have PLC CPU313C and the operatin panel OP7. I made an automatic mode application, when i insert the parameters which are STEP number, and input from 1 to 4 everithing works fine, but when i try to run the application the second time the OP7 reports the error $304 Task invalid...

Can somebody help me out on this one. Thank you for your time and help. Regards.

The OP manuals states what the messages mean but in this case I can not interpret the message,

Illegal S5 job number or job parameters in a function field.

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Look at this manual in Appendix http://cache.automation.siemens.com/dnl/TQ2OTczAAAA_1145112_HB/Op717_e.pdf​