How to fix a crash from Resource Pack

I wanted to log into my game and start the game so that I could go onto my favorite server. My game had just recently crashed while I was on the server from switching resource packs in game.

My game is constantly crashing and tells me to change my texture pack. I have no idea how to if I cant get in game.

Steps to Reproduce:
1. Download Sphax pureBDCraft
2. Change in game
3. Crashes
4. Try to login
5. Multiple crash reports