If you are playing on a modded profile (Forge/Fabric):
To fix the problem, we first need to understand what the game is trying to tell us. If you are playing on a modded profile
: In some versions (like 1.21), old or incompatible shaders within a resource pack can cause a total reload failure. Deleting the assets/minecraft/shaders folder from your active pack can often fix this Check JSON Validity Essentially, Minecraft’s engine is saying: “I looked for
The error message claims that the first category is missing. Essentially, Minecraft’s engine is saying: “I looked for my internal DNA to draw the dirt block, and it wasn’t there.” If you are playing on a modded profile
You are trying to load a world or use a resource pack designed for a significantly different version of Minecraft.
In the level.dat file of a saved world, there is a flag called ResourcePack . If you previously forced a broken pack onto a world, then removed that pack from the global folder, the world might still try to load the missing pack—and then panic when it can’t revert to vanilla.