Can not add Box2D in processing

I was reading The Nature of Code ( the book written by Mr. Daniel Shifman). There I found the chapter which contains physics libraries. I wanted to add Box2D (the processing version of Box2D) to my processing.

I downloaded the library for pbox2d from this link - . And then I added it to processing.

But when I implemented some code from nature of code it did not work. For example processing was saying that there is nothing as PBox2D.

Please help me. Thanks in advance

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assuming you use
Processing IDE 3.5.3 can load library:

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Thanks a lot. It worked fine…