Ora-39126 Worker Unexpected Fatal Error In Kupw-worker.prepare-data-imp 71 [2021] Link

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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