Some Error i got

[SLB7awesome]

Minecraft Logs

Incompatible mods found!
net.fabricmc.loader.impl.FormattedException: Some of your mods are incompatible with the game or each other!
A potential solution has been determined, this may resolve your problem:
	 - Install fabric, any version.
More details:
	 - Mod 'Legacy4J' (legacy) 1.7.4 requires any version of fabric, which is missing!
	at net.fabricmc.loader.impl.FormattedException.ofLocalized(FormattedException.java:51)
	at net.fabricmc.loader.impl.FabricLoaderImpl.load(FabricLoaderImpl.java:196)
	at net.fabricmc.loader.impl.launch.knot.Knot.init(Knot.java:146)
	at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:68)
	at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23)

Description

I was trying to install Legacy4J but i got this error.

[syn7ax-3rr0r]

You should try either reinstalling fabric or installing fabric api if you havent already

[DJR-dev]

It could be due to not having fabric-api installed?

[rotgruengelb]

Do you have fabric-api installed?