Earlier today, I tried to login to my single player Minecraft world, which uses a lot of mods, and I sat there for about 1 hour with a loading world screen. It only closed when I force-closed minecraft. I restarted my computer, got rid of some mods, updated forge and Java and it still doesn't work! I checked the crash log, nothing seems wrong to me. But I don't really know lots of stuff about minecraft so...
Mods I have installed: Fairy lights mod, Mo'creatures, Biblio craft, wee flowers, biomes'o plenty, custom mob spawner
crash-2017-12-26_22.34.57-server.txt