Oracle Solution for Error ora-28100

Solution for Oracle Error ORA-28100

ORA-28100: policy function schema string is invalid

What triggered the Error:

e schema was dropped after the policy associated with the function had been added to the object.

What should we do to fix it:

op the policy and re-create it with a policy function owned by a valid user. Or re-create the user and the policy function under the new user.