Mods not loading: solving mod problems systematically

Mods or plugins won't load on your game server? Check logs, match versions, isolate conflicts — how to find the broken mod.

Last updated July 20, 2026 · RespawnHost

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When mods don’t load, there are three typical causes: wrong game/loader version, missing dependencies, or two mods interfering with each other. The log in the console almost always names the mod that’s causing trouble during server startup.

How to narrow down the problem

  1. Read the log: Start the server and watch the mod loading messages in the console. Error messages usually name the mod, a missing dependency (“requires …”), or a version conflict.
  2. Check versions: Mod, mod loader (e.g. Forge/Fabric for Minecraft), and game version must match. A mod built for a different game version won’t load or will crash.
  3. Install dependencies: Many mods need library mods. The Marketplace installs dependencies automatically for supported games — with manual installation you have to add them yourself.
  4. Binary search: If the server won’t load with many mods, temporarily move half the mods out of the mods/ folder (file manager), start, and isolate the broken mod in a few passes.

Tip

Install mods, modpacks, and plugins via the Marketplace in the panel where possible — source, version, and dependencies match there, and the "Installed" tab shows what's on the server.

Client and server must match

For many games (e.g. Minecraft with Forge/Fabric, DayZ, Arma), all players need the same mods in the same versions as the server. Typical symptoms of mismatches:

  • Join aborts with a mod mismatch message
  • Players see missing content or crash while connecting

In that case, update the modpack on all clients — or with panel installations: use the same modpack version as on the server.

Everything broke after a game update?

That’s normal: major game updates regularly break mods until authors catch up. Options:

  • Wait until the most important mods are updated, and only then apply the server update.
  • Restore a backup and keep playing on the old version until the mod ecosystem has caught up (Backups).

Warning

Create a backup before any major mod change. A broken mod state is quickly restored — a wrecked world without a backup is not.

Frequently asked questions

How do I tell which mod is causing the problem? From the server log: mods load in sequence at startup, and the error message almost always names the culprit or the missing dependency. Without a clear log hint, use the binary search approach.

Why doesn’t a mod load although it’s in the mods folder? Usually the version doesn’t match (game or mod loader), or a dependency is missing. Some games also expect mods in a specific subfolder or a configuration list — see your game’s mod guide.

Do I need to install mods on both client and server? Depends on the game: server plugins (e.g. Minecraft Paper) are server-side only, classic mods often need both sides. The respective game guide in the wiki describes this in detail.