Cannot start Minecraft most of the time due to texture pack issue

Most of the time when trying to start Minecraft I recieve this error message...

"The game crashed whilst initializing game
Error: byx: Unable to fit: minecraft:blocks/lava_flow - size: 32x32 - Maybe try a lowerresolution resourcepack?"

The game will sometimes start and will have no issues while running. However, just loading the game will generate the error most of the time. The game is unmodded and I'm not using any custom texture packs.