Export of request & already running

What causes this issue?

You have rescheduled the export of transport requests even though an
export has not yet finished.

System Response

The system terminates the rescheduled export.

How to fix this error?

Wait until the scheduled release process has finished.

Procedure for System Administrators

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.