What causes this issue?

You tried to access maintenance of searches of the search framework by
directly calling a view cluster or maintenance dialog. This can lead to
inconsistent customizing data due to missing initialization.

System Response

You are not permitted to directly call a view cluster or maintenance
dialog to maintain searches for the search framework.

How to fix this error?

Start transaction IGN_SEARCH_MAINTAIN.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.