Hello and welcome to the monastery.

"File write error" looks very suspicious if all its doing is trying to find a module. What exactly did you do in your "single task on single thread" test that worked? How was the code different than the code that is failing?

In reply to Re: Troubleshoot a path problem when multithreading on cluster by Loops
in thread Troubleshoot a path problem when multithreading on cluster by wayne_deng2000

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