Make a flat world of end and nether like a simple flat worlds!

We are unable to diagnose your issue due to the lack of proper debug information. Please review the guidelines before reporting issues.
In case of a game crash, please also attach the crash log from [minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/guides/finding-minecraft-data-folder/].

-- I am a bot. This action was performed automagically!

This is a suggestion. Please post to /r/minecraftsuggestions/ instead.