I am fairly new to the processing interface, and have been following tutorials on the Plethora Project website. The most recent tutorial I went through was on the physics of springs. This tutorial  required me to import  verletphysics from the toxiclibs compilation library into the program I was writing. However when i import the verletphysics library it is missing both toxi.physics.behaviors and toxi.physics2d.behaviors packages. I have repeatedly erased and re downloaded the newest toxiclibs compilation and still I continually find  toxi.physics.behaviors/toxi.physics2d.behaviors missing from the library.  I am not sure if the problem is an error on my part or a corruption in what i am downloading? Does anyone have any advice to help me solve this problem?