P8gGraphicsSVG for Processing 3?

I'm running Processing 3.0.1 and installed the P8gGraphicsSVG library. I tried executing the code given by Andreas Schlegel in this post: https://forum.processing.org/one/topic/pgraphicssvg-a-new-renderer-for-svg-graphics.html

Processing says that The type processing.core.PGraphicsJava3D cannot be resolved. It is indirectly referenced from required .class files

What could I be doing wrong? Thanks!