Check following KB (SAP Note) - 1181953 - Errors: "ADM0161," "DA0005," "ORA-12535," "ORA-00911,"ORA-01001" and "ORA-12560" after moving repository and data source databases between database servers.
Either connection to your Document domain is not working or you have corrupted DB and need to restore from backup.
Please note, 5.1 is no longer supported. Only online content is still available.
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