It keeps loading, but never get the program running.
Anyone knows what’s wrong with it? Thanks a lot!
Simple! Set the boolean running to true! 
Just joking. You need to post your whole code to find out what’s happening.
Hello,
Try to isolate the problem.
Remove and\or comment out code until you isolate problem.
Post a small snippet of code showing the issue.
Please post properly formatted code:
https://discourse.processing.org/faq#format-your-code
:)