Whenever i open a server, it crashes with in 10 seconds, i tried repairing it on the website, but it didn't work

*What I expected to happen was a server to open
Describe what you thought should happen here

*What actually happened was it crashed and booted me out and minecraft corrupted

Steps to Reproduce:
1. Open minecraft
2. open a server
3. wait 10 seconds and minecraft gets corrupted