RFC Function module executing in tasks error

Hi Gurus,
I have a rfc enabled function module that I am executing in tasks . The first two passes went correct but the third pass gave the shortdump: Communication failure.
What can be done to correct this .
A RAISE statement in the program "SAPLYQM_PLANT_REL" raised the exception
condition "COMMUNICATION_FAILURE".
Since the exception was not intercepted by a superior
program, processing was terminated.
>>>>>>CALL FUNCTION 'YQM_SAMPLE_RELEASE_TASKS' starting new task 'FUNC1'
            destination 'NONE'
             performing set_function1_done on end of task
     EXPORTING
       I_PHYNR      = i_PHYNR
       I_YYPREPDATE = i_YYPREPDATE
       I_REL        = I_REL
     TABLES
       T_RETURN     = t_RETURN.
   wait until functioncall1 = done.
Thank you .

Hi,
the error COMMUNICATION FAILURE occurs if a server is unavailable for  processing of the task or possibly there is no free processes available.
Check this link.
It has a good example how to handle teh error.
[http://saphelp.border-states.com/EN/fa/096e92543b11d1898e0000e8322d00/frameset.htm]
Regards,
Ankur Parab

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