Quick answer: ARK mod crash: disable mods one by one, check load order, install missing dependency mods and update all Workshop mods after ARK patch.
If you landed here: Server crashes on start, on join or after mod install – log shows mod ID or "Failed to load mod".
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Frequently asked questions (FAQ)
ARK server crashes after mod install?
Remove mods one by one (test ModList). Check load order. Install missing dependency mods from Workshop. Server and client mods must match.
Which ARK mods often cause crashes?
Structures Plus, Primal Fear, large total conversion mods. After ARK patch update all Workshop mods.
Mod version mismatch ARK?
Auto-update Steam Workshop mods. Restart server after mod update. Players must load mods too (download on join).