I haven't changed anything in the guess number war file, it is completly untouched when I get that error. It seems like Tomcat is unable to understand a JSF taglib in the guess number war file. The weird thing is that I'm able to get everything running properly under a Windows XP configuration. When I try this on Mac OSX it has this problem, I have tried to use the .tar.gz files and from the command line extract them because I knew there was an issue with Stuffit Expander not expanding these files properly but still I get the same error. I cannot figure this out, if anyone has this working please let me know how you got everything running properly.