When I attempt to join mythcraft on 1.7.10 it crashes me and says "Ticking Screen"

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What I expected to happen was...:
Describe what you thought should happen here
I thought I would be able to join Mythcraft while using Minecraft 1.7.10
What actually happened was...:
Describe what happened here
My minecraft crashes and says "Ticking Screen"
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...
3. ...