Unknown modifier with keycode: 0

[KJGinger]

Hello, and thanks for taking the time for trying to help me, I'll try to be quick and concise.

 

I've been working on creating a modpack with a decently large amount of mods. I hope to have this pack hosted as a private pack by the folks at FTB, so I have been using MultiMC to help compile it. I've managed to work out most of the issues up to this point, but I have found no information regarding this one error in particular: "Unknown modifier with keycode: 0"

After most of the launch completes, the minecraft window gets stuck on the 'Mojang' screen, and prints out this error every time I tab out and then back into the Minecraft Session. Here is the log: [REDACTED: See Edit]

 

If I've left out any important information, please let me know, I'd be happy to add more if helpful.

 

[EDIT] In Review of the logs, I realize they stop before they arrive at the same point they do in my console window. Everything from the Console Menu is added below.

 

http://pastebin.com/NTwn2LjB

[sequituri]

That message is from a keyboard handler somewhere in your game: It is saying that whatever modifier (Shift,Control,Alt,Meta etc.) you are holding when you press ESC (keycode 0) is confusing it. It doesn't appear to be fatal.