Having problems launching game on Mac

Hi, I haven't played Minecraft on my MacBook for a while so this may have happened since installing Mavericks. I'm not an experienced player and don't understand most of the development side of things but will upload the Development Console notes to this as I hope it will help better than myself explaining.

What I expected to happen was...:
I was hoping to play the game as usual

What actually happened was...:
It didn't work. No popup or anything telling me otherwise, I got bored of waiting and saw the development console. It told me to report the error here.

Steps to Reproduce:
I haven't because it won't let me press play