it seems that swlogger has failed to load. This could be something to do with the version of java you have on your pc or the way you have installed the mod.
I updated java to the latest version, and removed all older versions. Still the same error message. When I install the mod, I delete Meta-Inf, and drag all files and directories from "put in minecraft.jar" to minecraft.jar . Then I drag the mods directory from "put in .minecraft" to .minecraft. Is there something I am obviously doing wrong?