How to fix the Oracle error PLS-00151: Expression or Variable is an illegal type to PLS/QL: string?

In this post, you’ll learn more about the Oracle ErrorPLS-00151: Expression or Variable is an illegal type to PLS/QL: string with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

PLS-00151: Expression or Variable is an illegal type to PLS/QL: string

Reason for the Error PLS-00151: Expression or Variable is an illegal type to PLS/QL: string

A type was used which does not belong PL/SQL. This type can only be referenced in CREATE TYPE statements, and is a non-queryable data type.

How to fix the Error PLS-00151: Expression or Variable is an illegal type to PLS/QL: string ?

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

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