Ora-39126 Worker Unexpected Fatal Error In Kupw-worker.prepare-data-imp 71 Fix -

ALTER TABLE problematic_table DISABLE ALL TRIGGERS; ALTER TABLE problematic_table MODIFY lob_column (lob_storage AS basicfile);

Suggested immediate next actions for you ALTER TABLE problematic_table DISABLE ALL TRIGGERS

impdp user/pwd DIRECTORY=dp_dir DUMPFILE=exp.dmp LOGFILE=imp.log TRACE=480300 11g Windows to 12c Linux)

If migrating between different OS types or major versions (e.g., 11g Windows to 12c Linux), avoid importing all schemas at once. Explicitly include only your application schemas and exclude system schemas: EXCLUDE=SCHEMA:"IN ('SYSMAN', 'XDB', 'WMSYS')" . 'WMSYS')" . Often

Often, the real error is hidden. Query the Data Pump job’s log file or use: