MotorKerbal

Hi, I'm new to mods so this is likely a mistake on my end. I've installed Kopernicus 1.2.2-1 and Galileo's planet pack. I extracted both of these into the GameData folder as from what I can gather you're supposed to do from the KSP Wiki. The program loads with all the witty loading hints, but I seem to get stuck on the black screen with the orbiting planets that say 'loading' on them before I get to the main menu (you know, like the loading screen you get upon launching a craft). This happens every time I attempt to load the game. Anyone know what I'm doing wrong? Thanks