EDX. Error=JobIsAlreadyRunningAndShouldNotBeQueued (8.5)

[#1]

Running publisher 8.5 and the error

The task "EDXT_PD_CNRS" failed. Cause=Exception. Exception=System.Exception: Could not request EDX. Error=JobIsAlreadyRunningAndShouldNotBeQueued at XSMain.TriggerEDXTask.InternalExecute() at XSMain.AbstractTask.InternalExecute2()

This is strange as I've requested it to queue.

......../ControlPanel/Job/RequestEDX.aspx?JobIdOrJobName=EDX_PD_CNRS&QueueIfRunning=True&EdxPassword...

Can anyone help with this please?