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You can constrain the processing nodes used by the parallel engine either by removing node descriptions from the configuration file or by constraining a job or stage to a particular node pool.

How to constraining a job or stage to a particular node pool ?

There is another post related to this problem http://www.dsxchange.com/viewtopic.php?p=179155&sid=3c15e5709b0cb8dd72d2976f43f257e2 I got the same error message sometimes on transformer and I set the "Preserve partitioning" to "Clear" in the previous stage. In your situation, ...

Are you reading or writing the file set / file ?

If reading, can you browse the file in the dataset/sequential stage ?