What I expected to happen was It loaded the level.
What actually happened was it just crashed while loading the game.
1. Load Sphax PureBDCraft texture pack.
2. Load a level.
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Based on a crash report provided in this issue, I believe with high certainty that this report may be a duplicate of MC-1661. If I am wrong, please go yell at Dinnerbone.
You are using a 256x256 pixels texture pack. Minecraft only supports 16x16 and lower without mods, and mods messing up Minecraft is out of Mojangs hands. This is not a bug. It's just a user error