Minecraft will not let me into my own server.

Put the summary of the bug you're having here

What I expected to happen was to join my server and play with my girlfriend.:
Describe what you thought should happen here Why would this happen?

What actually happened was I was about to join the server that my gf was on and when I clicked join server it went on like usual then it just crashed and went to the start up menu that said Sorry for the inconvenience.
Describe what happened here

Steps to Reproduce:
1. Log on minecraft
2. Go to my server
3. You get crashed