Archiving session &1 is invalid or marked for archiving

What causes this issue?

The current program processes an archiving session that is marked for
deletion or as invalid.

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?

If you want to process the archive session, deactivate the "For
Deletion" indicator or the "Invalid" indicator in the management part
of transaction SARA. Remember that for some archiving objects, the
invalid indicator, once set, cannot be deactivated.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.