---
title: "How to fix \"incompatible mod\" errors or crashes while loading mods"
description: "A guide to identifying and fixing crashes caused by incompatible mods, missing dependencies or conflicts between mods on your server."
url: "https://redhosting.com.br/en/base-de-conhecimento/como-resolver-mod-incompativel-ou-crash-no-carregamento-de-mods"
type: "article"
language: "en"
category: "Minecraft"
published: "2026-09-11"
translations:
  pt-BR: "https://redhosting.com.br/base-de-conhecimento/como-resolver-mod-incompativel-ou-crash-no-carregamento-de-mods.md"
  en: "https://redhosting.com.br/en/base-de-conhecimento/como-resolver-mod-incompativel-ou-crash-no-carregamento-de-mods.md"
  es: "https://redhosting.com.br/es/base-de-conhecimento/como-resolver-mod-incompativel-ou-crash-no-carregamento-de-mods.md"
  de: "https://redhosting.com.br/de/base-de-conhecimento/como-resolver-mod-incompativel-ou-crash-no-carregamento-de-mods.md"
---

# How to fix "incompatible mod" errors or crashes while loading mods

A guide to identifying and fixing crashes caused by incompatible mods, missing dependencies or conflicts between mods on your server.

- RedHosting knowledge base guide — category: Minecraft
- HTML page: https://redhosting.com.br/en/base-de-conhecimento/como-resolver-mod-incompativel-ou-crash-no-carregamento-de-mods
- Published on: 2026-09-11 · Language: en

## 1. Where to find crash information

When the server crashes on startup, Minecraft usually generates two useful kinds of file:

- `logs/latest.log` — the full record of what happened up to the crash.
- `crash-reports/crash-*.txt` — a detailed error report, usually easier to read.

Open these files from the panel's **Files** tab.

## 2. Checking the Forge/Fabric/NeoForge version

The most common cause of crashes is a **version mismatch**:

- Check that the mod was made for the **same Minecraft version** installed on the server (e.g. a 1.20.1 mod on a 1.21 server won't work).
- Check that the mod is for the **right loader** — a Fabric mod doesn't work on a Forge server, and vice versa.

## 3. Missing dependencies

Many mods depend on extra libraries to work. The most common are:

- **Fabric API** (required by most Fabric mods).
- **Forge Config API Port**, **Architectury API**, **Cloth Config** (used by many multiplatform mods).

In the `crash-report`, look for messages like:

```
Mod X requires Y, which is missing
```

This tells you exactly which dependency needs to be installed in the `mods` folder.

## 4. Client-side mods running on the server

Some mods are **client-only** (e.g. UI mods, shaders, minimaps) and shouldn't be put on the server — this usually causes an immediate crash on startup.

  ℹ️
  Check the mod's page (CurseForge/Modrinth) — it usually says whether it's "Client", "Server" or "Client and Server".

## 5. Finding which mod is causing the problem

In the `crash-report`, look for the **"Affected Mods"** section or the **stack trace**, which usually shows the culprit mod's name near the start of the error.

If it's not clear, use the **bisection** method:

1. Remove half of the mods from the `mods` folder (move them to another folder, don't delete them).
2. Restart the server.
3. If the error goes away, the problem mod is in the group you removed — repeat by splitting that group in half.
4. If the error persists, the problem is in the group that stayed — repeat the process.

## 6. Conflicts between mods

Two mods can conflict when they change the same thing in the game (e.g. two mods that modify world generation). In that case:

- Check whether there's a compatibility version between them (many popular mods release "compat patches").
- Check the mod's page on CurseForge/Modrinth for known incompatibility warnings.

## 7. The most common fixes

- Update the mod to the latest version compatible with the server.
- Install the missing dependency.
- Remove client-side mods from the server folder.
- Reinstall Forge/Fabric if the loader files are corrupted.

  ℹ️
  If you can't pin down the problem yourself, send the `crash-report` or `latest.log` file to our support — it speeds up the diagnosis a lot.

## Navigation — Minecraft (article 11 of 12)

- Previous article: [How to set up Bedrock + Geyser/Floodgate (cross-play between Java and Bedrock)](https://redhosting.com.br/en/base-de-conhecimento/como-configurar-bedrock-geyserfloodgate-cross-play-entre-java-e-bedrock.md) — https://redhosting.com.br/en/base-de-conhecimento/como-configurar-bedrock-geyserfloodgate-cross-play-entre-java-e-bedrock
- Next article: [How to add Add-ons (BP/RP) to Bedrock servers](https://redhosting.com.br/en/base-de-conhecimento/como-adicionar-addons-bprp-em-servidores-bedrock.md) — https://redhosting.com.br/en/base-de-conhecimento/como-adicionar-addons-bprp-em-servidores-bedrock
- Back to the knowledge base: https://redhosting.com.br/en/base-de-conhecimento

---

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More guides: https://redhosting.com.br/en/base-de-conhecimento.md