Crash on startup with Minecraft 26.1 (Fabric)

[gamparda]

Stack trace

[17:05:17] [main/ERROR]: Uncaught exception in thread "main"
java.lang.RuntimeException: An exception occurred when launching the server!
at net.fabricmc.loader.impl.launch.server.FabricServerLauncher.main(FabricServerLauncher.java:71)

Caused by: java.lang.RuntimeException: Failed to read classTweaker file from mod grimac
at net.fabricmc.loader.impl.FabricLoaderImpl.loadClassTweakers(FabricLoaderImpl.java:534)
at net.fabricmc.loader.impl.launch.knot.Knot.init(Knot.java:145)
at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:66)
at net.fabricmc.loader.impl.launch.knot.KnotServer.main(KnotServer.java:23)
at net.fabricmc.loader.impl.launch.server.FabricServerLauncher.main(FabricServerLauncher.java:69)

Caused by: net.fabricmc.loader.impl.lib.classtweaker.reader.ClassTweakerFormatException: Namespace (intermediary) does not match current runtime namespace (official)
at net.fabricmc.loader.impl.lib.classtweaker.reader.ClassTweakerReaderImpl.error(ClassTweakerReaderImpl.java:305)
at net.fabricmc.loader.impl.lib.classtweaker.reader.ClassTweakerReaderImpl.read(ClassTweakerReaderImpl.java:93)
at net.fabricmc.loader.impl.FabricLoaderImpl.loadClassTweakers(FabricLoaderImpl.java:532)
... 4 more

latest.log

How to replicate it if known

No response

Grim version

2.3.74-bf10e23

Server version

26.1

Affected Platform(s)

Fabric

Plugins/Mods

[SamB440]

#2554 but I'll leave this open since it's fabric specific

[TQTVN]

Yep I have same problem

[Dibbli]

+1, same crash on MC 26.1.2 / Loader 0.19.2 / Grim 2.3.74-2af658c.

[JoshyTheDev]

+1, same problem here with Grim Anticheat (Fabric) 2.3.74-34c41db. I've also tried previous versions that are few days old and same issue (which I expected anyways).