For report &1, the variant &2 does not exist (flow definition &3)

What causes this issue?

The variant of a report was used in the specified flow definition.
However this variant no longer exists.

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?

Use another variant or recreate the desired variant.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.