Game crashes everytime I try to launch it.

The game crashed whilst initializing game
Error: cdo: Unable to fit: minecraft:blocks/lava_flow, size: 64x64, atlas: 0x0, atlasMax: -1x-1 - Maybe try a lower resolution resourcepack?

I get this everytime I try to launch Minecraft, I have removed said resourcepack that I last used before I closed minecraft. I do not use any mods, shaders or anything like that, just Optifine.