Hey Elusive, CATERPILLAR occurs when you are having trouble connecting to or maintaining a connection to Destiny matchmaking servers. If this is the first time you’ve received this error, please try again and resume what you were doing before the error occurred. This error can also be hit if you log out of your account while Destiny is running. If you encounter the issue a second time, please exit Destiny and relaunch the game. That said, there was a general server error that occurred quite recently on the Xbox (ignore if PS). I'm pretty sure it's just a one time thing, so you should just try again later.