Hello all very new to abaqus and am currently trying to use a model someone else created to get outputs and I am having the following problem;

I have created a set on the pipe in my model and changed the field output request to Output the stress on the set created, however when i submit the job (by running the input file) it aborts with the following error; 

error in job Job-8: in keyword *ELEMENTOUTPUT, file "Job-8.inp", line 23965: Unknown part instance set PIPE-1.SET-1

Error in job Job-8: ELEMENT SET ASSEMBLY_PIPE-1_SET-1 HAS NOT BEEN DEFINED

Job Job-8: Analysis Input File Processor aborted due to errors.

Error in job Job-8: Analysis Input File Processor exited with an error.Job Job-8 aborted due to errors

anyone have any ideas how I can fix this?? any help will be greatly appreciated

 Cheers,

Alistair