[solved; install nightly build of DH]

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:
  • Remove mod 'Distant Horizons' (distanthorizons) 2.0.1-a (C:\Users\nynchik\AppData\Roaming.minecraft\mods\DistantHorizons-2.0.1-a-1.20.1.jar).
  • Remove mod 'Distant Horizons' (distanthorizons) 2.0.1-a (C:\Users\nynchik\AppData\Roaming.minecraft\mods\DistantHorizons-2.0.1-a-1.20.1.jar).
    More details:
  • Mod 'Iris' (iris) 1.7.0+mc1.20.1 is incompatible with version 2.0.1 or earlier of mod 'Distant Horizons' (distanthorizons), but a matching version is present: 2.0.1-a!
  • Mod 'Fastload Fabric-api Forwarding' (fastload_fapi_forward) 1.0.2 requires version 1.19.3 of 'Minecraft' (minecraft), but only the wrong version is present: 1.20.1!
    at net.fabricmc.loader.impl.FormattedException.ofLocalized(FormattedException.java:51)
    at net.fabricmc.loader.impl.FabricLoaderImpl.load(FabricLoaderImpl.java:195)
    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)
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