it kickes me of my minecraft when i log onto a server and singleplayer

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it wont et me play the game cause it kickes meh
What I expected to happen was...:
Describe what you thought should happen here
let me join a server
What actually happened was...:
Describe what happened here

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...
3. ...