[1.8]Trouble with a custom command

Hey all i have been trying to create a command and having followed everything about it online, when the server loads it crashes. I'm pretty certain its a problem with the way I registered it but I don't see why. Any help would be very useful.

Crash log:

http://pastebin.com/CbSpVTkX

Command Register

@Mod.EventHandler

public void serverLoad(FMLServerStartingEvent event) {

CommandHandler commandManager = (CommandHandler) event.getServer().getCommandManager();

commandManager.registerCommand(new CommandMusic());

}

Command Class

http://pastebin.com/MnKDPLLd