When I open up Minecraft it always says Erorr in run Minecraft

I was trying to switch the version, from 1.11.2 to 1.8.9, when it loaded it pop-up this Error (Imgur_MinecraftCrashed) [Imgur](http://i.imgur.com/RLIk5bx.png), and it didn't happend only now, it happened all the time I switch versions, a lot of times had happened.