Setting: Resource category & does not exist

What causes this issue?

You are attempting to edit a resource with resource category &V1&.
However, this is no longer possible for one of the following reasons:
The resource category does not exist.
The resource category did exist but was deleted in Customizing.
You have not maintained a suitable usage for the application (for
example, Production Planning) in Customizing.

How to fix this error?

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

Enter an existing resource category or
delete all resources with resource category &V1&, if the resource
category was deleted, or
set up resource category &V1& in Customizing or
maintain a suitable usage in Customizing for resources.

Error message extract from SAP system. Copyright SAP SE.