Trying to switch to Python mode after installing it in Processing IDE

I am trying to switch modes from Java to Python in the Processing (py) IDE. I am a beginner programmer so you can understand the frustration.

Upon trying to switch I get the following error: 

I am running Mac OS X Yosemite 10.10.5. Processing version 3.3.6. I have tried removing and re-installing the Python add-on, but I still get same message everytime I try to switch.

Any advice?

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