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This issue occurs because SQL Server does not support manual updates to system tables. System tables should be updated only by the SQL Server database engine.
To resolve this issue, use one of the following methods.
Method 1
If you have a clean backup of the database, restore the database from the backup.
Note This method works only if the backup does not have inconsistencies in the metadata.
Method 2
If you cannot restore the database from a backup, read info here https://www.repairtoolbox.com/sqlserverrepair.html