How to fix the Oracle error PLS-00256: string is not a valid external library or assembly?

In this post, you’ll learn more about the Oracle ErrorPLS-00256: string is not a valid external library or assembly with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

PLS-00256: string is not a valid external library or assembly

Reason for the Error PLS-00256: string is not a valid external library or assembly

The supplied external library or assembly name in the external clause is not a valid alias library or assembly.

How to fix the Error PLS-00256: string is not a valid external library or assembly ?

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

Provide the name of a valid alias library or assembly which is previously declared.