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in case this is a RAC and you are importing or exporting a file you should set the Parameter cluster to N.
Otherwise the system will try to use all your RAC nodes for import or export and you get this error because one of the nodes did not find the directory.
Utilize cluster resources and distribute workers across the Oracle RAC.
Valid keyword values are: [Y] and N.
Just make sure that each node in the rack has the directory object defined. You could have it defined on node a and one of the Data Pump processes could be started on node b. If node b does not have the directory object defined, then you could get this error. You do not have to set cluster=n. It may fix the problem because all of the processes will be started on the same node, but defining the directory object and making sure each node has access to the disk should solve the problem.