Job & is already active

What causes this issue?

The feasibility of the chosen form of processing depends on the status
of the background job. The selected background job is characterized as
ready or active. The required operation is not feasible in this status.

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?

Check the choice of processing or the background job.

Error message extract from SAP system. Copyright SAP SE.