How to fix the Oracle error ORA-55366: unknown namespace prefix “string”?

In this post, you’ll learn more about the Oracle ErrorORA-55366: unknown namespace prefix “string” with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-55366: unknown namespace prefix “string”

Reason for the Error ORA-55366: unknown namespace prefix “string”

An attempt was made to make use of an undefined namespace prefix in Oracle Virtual Private Database (VPD) metadata.

How to fix the Error ORA-55366: unknown namespace prefix “string” ?

You can fix this error in Oracle by following the below steps

Correct the input and try again.