C:\Users\natan\AppData\Roaming\.minecraft\hs_err_pid6480.log
Can you attach this as a .txt file?
Confirmed for Minecraft Release 1.9
Confirmed for Minecraft Release 1.9
[22:58:34] [Server thread/INFO]: Changing view distance to 8, from 10
You're attempting to load a world after switching versions of Minecraft. The previous version from which you switched allowed you to change your viewing distance to a higher value then the version you are currently using supports. Revert back to the previous version of Minecraft you were using, change the viewing distance to below 8, change to the version you were trying to use, and see if the problem occurs.
Another thing you could try; go into your profile settings in the initial Launcher and delete all the JVM arguments.