I'm not sure exactly what is going on. I am only using MFL. I am using the most recent version. It works fine if there are no mods to load. I considered that it might be the mod, but I tried 2 separate mods individually and the same problem occurred each time. I repeated the exact same procedure on 2 other computers in my house with the same results.
The mods I have tried to load are backpack-1.7.8-1.5, EnderStuff-Plus-Mod-1.5.
Please let me know if this is a common error or what I can do to fix it.