Using multiple outputs in Minim - speaker output gets disabled


First time posting…

Im a beginner but Im using minim library to create multiple outputs.
I have the usb port working with speakers and the speakers on my Mac working.
But when I plug a second set of speakers into my headphone port on my Mac , it seems to disable something and I get no output and a nullpointer error message that can’t find the audio file.

I think its something with the mixer ID but when I printl the outputs and try each one (none of which mention the headphone port) the program crashes…

Any help appreciated

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