i cant play in 1.7.10

Put the summary of the bug you're having here
i cant pla in 1.7.10
What I expected to happen was...:
some kind off bug

What actually happened was...:
game crashed all the time when i play 1.7.10 and i can play 1.8

Steps to Reproduce:
1. i start minecraft whit 1.7.10
2. i start a minecraft 1.7.10 server
3. game crash over and over