Just tested my Arduino without the sensors connected & get the same error you're getting (I'm using SGPo)... once you have all your components do a pre-build test & let me know if you still have issues.
Yes, restrict the field of view... forgot to mention that!
Guess you need to narrow the aperture a little more, I used appropriate sized rubber O-ring inside the tube as this depending on position reduced the angle/field... already had an assorted set.
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