How to fix the Oracle error PLS-01912: : instance must of be of type ‘string’?

In this post, you’ll learn more about the Oracle ErrorPLS-01912: : instance must of be of type ‘string’ with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

PLS-01912: : instance must of be of type ‘string’

Reason for the Error PLS-01912: : instance must of be of type ‘string’

The run-time type of the instance is not the declared type. e.g. If the return value of a user defined constructor is wrong.

How to fix the Error PLS-01912: : instance must of be of type ‘string’ ?

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

Return the correct type.