Error Codes › net.fabricmc.loader.impl.FormattedException

net.fabricmc.loader.impl.FormattedException

COAL-007 · Fabric Loader refused to start

Fabric Loader aborted startup. This exception confirms a mod set problem reported elsewhere in the log rather than being a separate fault of its own.

What it looks like in the log

Exception in thread "main" net.fabricmc.loader.impl.FormattedException: Incompatible mod set!
	at net.fabricmc.loader.impl.FabricLoaderImpl.load(FabricLoaderImpl.java:216)

What it means

Fabric Loader checked your mod set, decided it could not be loaded, and stopped. This exception is the stop itself, not the reason. Fabric always prints the reason in plain English immediately above this line - a missing dependency, a version conflict, or a duplicate mod.

How to fix it

Scroll up until you find the human-readable block Fabric printed just before this. It normally reads as a bullet list of unmet requirements, sometimes followed by a suggested fix. Work from that, not from this exception. The likely targets: