Put the summary of the bug you're having here
What I expected to happen was...:
What i expected to happen was to have the singleplayer world to load.
What actually happened was...:
What actually happened was that the game crashes upon loading the world for the first time.
Steps to Reproduce:
1. Launch Game
2. Click Singleplayer
3. Create World
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Incomplete without a crash report from ([minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/finding-minecraft-data-folder]
). Please attach it so that we can diagnose your issue.
For technical support please use the Mojang Support Center.

Dupe of MC-34749