What confuses me is that one of the errors is about being unable to find a font file. I put all the necessary vector image files, and the font file in particular in the project's assets folder, so I'm not sure what is a happening there.

Mainly, the errors seem to be concerned that "the source attachment does not contain the source for the file PApplet.class". I have imported the processing.core.* to all of my classes, and the main class extends PApplet. In a similar project I do not get this error.

Here is the code of my main class, if you need me to clarify anything don't hesitate to ask.

I basically asked the same question on stackoverflow but I thought it would be worth posting here in case anyone had the same problem. Please ask if I can clarify anything.