audacity set up

hi,can anyone help?

i have recently purchased a numark mixtrack pro and i am running traktor le.

i have downloaded audacity to record my mixing,but cant seem to record?
error box;error while opening sound device.please check the input device settings and sample rate.
what do i do?please help!

Make sure you are sending Audacity audio (not MIDI) and not using MIDI controllers.

Try all the steps here .

Choose the “Windows Direct Sound” host in Audacity Device Toolbar, not MME. According to MME might not be supported.