Question about Nyquist tones plugin

I can’t generate this Nyquist sound. Message:
sdsas1.JPG
How to fix this?

You’re probably trying to generate a stereo (2 channel) sound into a mono (1 channel) track.
If you are wanting to generate into a new track, try creating a new stereo track first, select the stereo track, then run your Nyquist code.