Yes, I am aware. It's crashing because you do not have OptiFine in your mods folder (it is searching for it, but can't find it). Please follow the guide I sent to uninstall OptiFine.
Are you implying that you have the same issue? If that's the case, then you have to do what is said: https://discuss.aristois.net/topic/23/invalid_checksum-error
It will work if you do it correctly. I also can't help if you are not using the official launcher