THe game keeps crashing on me and won't stop

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What I expected to happen was...:
Describe what you thought should happen here
that i would get on multiplayer and play on DesiredCraft
What actually happened was...:
Describe what happened here
I started the DesiredCraft and 1 minute later it crashed
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...
3. ...