Missing type rectangle Error

Im trying to replicate a light tracking project

I imported the code, but I getn the followin error:

Im new at processing (and just starting programing)

But I understand this is old code and some of the language has changed over the years.

Can anyone point me at the right direction to solve this?

Thanks you very much

(the complete code is here: https://github.com/frischmilch/tracking-light

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