Class &1 to be registered is not known

What causes this issue?

The archiving object or archiving class &V2& tried to register the
archiving class &V1&. The system does not recognize this class.

System Response

Archiving terminates.

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.

Error message extract from SAP system. Copyright SAP SE.