How to fix the Oracle error PLS-00668: Type of expression should be a collection type?

In this post, you’ll learn more about the Oracle ErrorPLS-00668: Type of expression should be a collection type with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

PLS-00668: Type of expression should be a collection type

Reason for the Error PLS-00668: Type of expression should be a collection type

An attempt was made to specify expression after INDICES OF or VALUES OF clause whose type is not a collection type.

How to fix the Error PLS-00668: Type of expression should be a collection type ?

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

Change the index collection expression type to a valid collection type.