I've just downloaded the library, as shown in that thread, and the test sketch ran without problems.
Re: Processing error cc
Reply #1 - 07.10.2010 at 12:34:05
In the arduino library that I downloaded and loaded into the preferences libraries directory I have a subdirectories called 'examples', 'library' and 'src' but the 'library' directory is empty and I presume this is my problem.
No. The presence or absence of Arduino libraries has no impact on the Processing application.
The cc.arduino library is the firmata plugin for Processing. You need to download and install the Processing library.http://www.arduino.cc/playground/Interfacing/Processing