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[sdasibnivhkl]

Incompatible mod set!
net.fabricmc.loader.impl.FormattedException: Mod resolution encountered an incompatible mod set!
A potential solution has been determined:
- Replace mod 'Fabric Loader' (fabricloader) 0.14.21 with version 0.15.6 or later.
Unmet dependency listing:
- Mod 'Fabric API' (fabric-api) 0.91.1+1.20.1 requires version 0.15.6 or later of mod 'Fabric Loader' (fabricloader), but only the wrong version is present: 0.14.21!
at net.fabricmc.loader.impl.FormattedException.ofLocalized(FormattedException.java:51)
at net.fabricmc.loader.impl.FabricLoaderImpl.load(FabricLoaderImpl.java:192)
at net.fabricmc.loader.impl.launch.knot.Knot.init(Knot.java:148)
at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:68)
at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23)

[Linguardium]

install a newer version of fabric modloader

[Poopooracoocoo]

To expand on this, how you'll update Fabric Loader depends on the launcher you're using. If you're using Minecraft Launcher, run the Fabric Installer again. If you're using a third party launcher, you can update Fabric Loader by changing your instance's options in your third party launcher.