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Please attach the crash report ([minecraft|http://hopper.minecraft.net/help/finding-minecraft-data-folder]/crash-reports/crash-<DATE>-client.txt
), otherwise we can not diagnose this issue.
For technical support please use the Mojang Support Center.
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This is the crash report file. Please fix this issue.

I actually figured out how to fix this! If you are on 1.10.1, that can cause issues for servers. Switch back to 1.10, and everything should work fine!

please tell me step by step how to go back to 1.10