Caused by: org.spongepowered.asm.mixin.transformer.throwables.MixinTargetAlreadyLoadedException: Critical problem: smsn-common.mixins.json:kubejs.KubeJSMixin from mod smsn target dev.latvian.mods.kubejs.KubeJS was loaded too early.

Thanks for the report! This appears related to #4. To help investigate:

• Share full crash logs via https://mclo.gs/
• Provide your installed mod list (/forge mods output)
• If possible, create a minimized test case by disabling other mods incrementally while keeping SMSN and KubeJS.

I'll prioritize analysis once these details are provided.