I play Minecraft several times per week. Today I've played twice.Once earlier today, I ran the game, and played. So on, I had to pause, and restarted the game when I came back, to minimalize lagging. (Yes, it starts hanging after second world load). So on, I exited the world, iconified the window, and closed my computer. It went into hibernate. Not long ago I reopened my computer, got Minecraft back up again (without any restart), loaded the world, and started playing again. The game soon started hanging, and I decided to restart it. I did this while logging on OneDrive, and getting it synchronizing. I pressed "Quit", in the game menu, and reopened Minecraft Launcher 2 from Start. I clicked on "PLAY", and launched it with the addons you can see listed. I've been using these for a few months, whereas the texture pack has been in use for a year. I launched the game exactly like before. Now, I got this error:

The game crashed whilst initializing game
Error: byx: Unable to fit: minecraft:blocks/mushroom_block_skin_red, size: 128x128, atlas: 2048x2048, atlasMax: 2048x2048 - Maybe try a lower resolution resourcepack?

I tried running the game without any addons. Same happened again. I've tried about 10 times at this time. This error came suddenly, and only two Things have happened since it worked: I logged on OneDrive, and explorer.exe crashed a little after.

I also clicked on "View crash report", but nothing happened.
I have never tried any snapshot.