No classification data has been created

What causes this issue?

You have classified an object and now you want to call classification
again, but with another object table.

System Response

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

How to fix this error?

An internal error has occurred.
INCLUDE NA_SYSADMIN1 OBJECT DOKU ID TX

Error message extract from SAP system. Copyright SAP SE.