Got some errors too... Sprocket.lua:385 (and 1320 in SprocketConfig.lua when opening config window) attempt to call method 'GetMenuName' (a nil value). (on load, and when try to use menu)
(GetNumFrames happened to me too... but can't reproduce it)
Looks like sth wrong with loading saved variables.
Test it on clean WoW install, w/o any addons or config files, only Sprocket (yup it's great ;p)