anytime i try to switch to 1.7.10 to play pixelmon because for some odd reason pixelmon is only in 1.7.10 my game crashes while trying to go on to the server.

Put the summary of the bug you're having here

What I expected to happen was...:
I thought it would work
What actually happened was...:
the whole game crashed

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. update pixelmon
3. fix the servers that are in 1.7.10