Crashes on startup with ClassNotFoundException: com.mojang.authlib.GameProfile – mod expects a valid premium session.

❌ Not compatible with SKLauncher.

None specific to SKLauncher. Mod doesn’t call Mojang servers.

✅ Highly recommended – full Create experience offline. Mod: Essential Mod (v1.3.5 for Fabric 1.20.1) Tested on SKLauncher: ❌ Fails to launch

Placed create-fabric-0.5.1f.jar + flywheel-fabric-1.20.1-0.6.11.jar in mods folder. No launcher issues.

Works flawlessly in single-player with 4GB RAM allocated. No crashes after 10+ hours. Stress tests with rotating contraptions run at stable 60 FPS (with Sodium + Iris).

4 mins

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