Explain how to fix the error if you find a newer pack you like?
Manual install steps
A Fullbright texture pack replaces that standard gradient. Instead of darkening at low light levels, the custom lightmap forces every light level (from 0 to 15) to display as maximum brightness. In essence, your screen never gets dark, even in a sealed cave at Y=11. fullbright texture pack 1.12.2 no optifine
For more information on the Fullbright Texture Pack 1.12.2 and other Minecraft texture packs, check out the following resources: Explain how to fix the error if you