Every time I open a world in any version it crashes pls fix it

Put the summary of the bug you're having here

What I expected to happen was...:
To Open the world so i could play minecraft

What actually happened was...:
When the world was in the middle of loading it crashes

Steps to Reproduce:
1. Have minecraft lancher 1.6.69
2. Have java version 8 update 111
3. Open any minecraft world