Minecraft Crashes soon after launching

Whenever I try to launch the game through the new launcher (or even through the old launcher lately), with Optifine or without it, the game either works for a minute tops, then crashes or simply crashes without even showing the game. Then the launcher shows the message on the screenshot, which I will translate now:

'The game has crashed. an unexpected error occured and the game has crashed. We are sorry for the inconvenience. Exit code: 0'

I tried every way that I know of to make it work again, but so far, to no avail. However, today I was lucky in a sense that the launcher decided to show me an error log (which it didn't do before, previously it was just the 'Close' button that appeared).

I hope someone will find an answer to that problem, as I simply cannot finish creating my resourcepack without access to the game and seeing if and how it works. thank you in advance for the help and if anything else is needed, I will try to provide.