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When importing into a target table with a different definition than the source:
Example:
Refreshing the database's internal statistics often resolves these internal worker errors.
Corrupt or invalid KUPW$WORKER or DBMS_METADATA package bodies can prevent the worker from initializing correctly.
: Specific bugs (e.g., Bug 28307854) in certain patch levels (like 12.1.0.2) can cause fatal errors when importing package bodies. Recommended Troubleshooting Steps
The error is a generic internal error in Oracle Data Pump that typically indicates an unhandled exception within the worker process during the data import preparation phase. Root Causes