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?
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Re^2: Troubleshoot a path problem when multithreading on cluster
by wayne_deng2000 (Initiate) on Nov 10, 2014 at 02:38 UTC