Changing texture pack to Sphax PureBDCraft and minecraft crashed

Put the summary of the bug you're having here

What I expected to happen was...:
Describe what you thought should happen here: It should change texture packs

What actually happened was...:
Describe what happened here: When i changed to Sphax PureBDCraft minecraft crashed

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...
3. ...