# Fixing FS25 LUA Errors

> Understand and fix LUA errors in FS25: how to find the culprit mod in the 'LUA call stack', interpret common error messages and solve the problem for good.

**Short answer:** A script error from a mod. The function (e.g. update or draw) is just the symptom — the culprit appears in the 'LUA call stack' as a mod folder name in the path (e.g. FS25_ExampleMod).

| | |
| --- | --- |
| Game | LS25 |
| Category | Troubleshooting |
| Difficulty | Advanced |
| Reading time | 8 min |
| Last updated | 2026-06-21 |
| Language | en |
| Source | https://agrarchaoten.com/en/guides/ls25-lua-fehler-server |
| Other language | https://agrarchaoten.com/guides/ls25-lua-fehler-server |

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## Contents

- [Overview](https://agrarchaoten.com/en/guides/ls25-lua-fehler-server#ueberblick)
- [What a LUA error looks like in the log](https://agrarchaoten.com/en/guides/ls25-lua-fehler-server#was-ist-lua-fehler)
- [Finding the culprit mod](https://agrarchaoten.com/en/guides/ls25-lua-fehler-server#verursacher-finden)
- [How to fix the error](https://agrarchaoten.com/en/guides/ls25-lua-fehler-server#beheben)
- [Common error messages](https://agrarchaoten.com/en/guides/ls25-lua-fehler-server#haeufige-meldungen)
- [When nothing helps](https://agrarchaoten.com/en/guides/ls25-lua-fehler-server#probleme)
- [FAQ](https://agrarchaoten.com/en/guides/ls25-lua-fehler-server#faq)

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## LUA errors in FS25 — overview

A **LUA error** is a script error that almost always comes from a **mod** — not from the base game. LUA is the programming language FS25 mods use to write their logic. If a script runs into an error, the server writes it to the log and stops the affected function. Sometimes the server crashes; often it keeps running but floods the log while individual mod features stop working.

**The good news:** The culprit is almost always right there in the error. The "LUA call stack" tells you which mod is triggering the problem — you just need to know where to look.

## What a LUA error looks like in the log

A typical entry in the server log looks like this:

Two things matter:

- **"Error: Running LUA method ..."** — the function that blows up (e.g. `update`, `draw`, `mouseEvent`). That's just the symptom.
- **The path in the "LUA call stack"** — this contains the **mod folder name** (in the example `FS25_BeispielMod`). **That's your culprit.**

## Finding the mod causing the error

**1. Open the log**

Open the server log (in the web interface or the `log.txt` via FTP). Use search (Ctrl+F) and look for `Error` or `LUA call stack`.

**2. Read the mod name from the path**

The call stack contains a path with `/mods/FS25_XXXX/...`. The `FS25_XXXX` part is the mod throwing the error.

**3. Check the frequency**

Does the same error show up hundreds of times? Then it's running every frame — a clear sign of a broken or outdated mod that urgently needs to be removed or updated.

## How to fix the error

**1. Update the mod**

Most common cause: the mod is outdated and doesn't match the current FS25 version. Download the latest version from the ModHub or from the creator's original source.

**2. Remove or replace the mod**

If there's no update, remove the mod from the mods folder via FTP and restart. For many popular mods (e.g. Courseplay, AutoDrive) there are well-maintained, up-to-date alternatives.

**3. Cross-check with an empty mods folder**

If the error disappears without mods, it's definitely caused by a mod. Then add the mods back step by step (see the mod conflict guide) until the error returns.

**Never dump everything in blindly:** Test new mods one at a time before they go on the live server — no matter how well-known the creator is. Wrongly named or repackaged "stolen" mods are a common source of errors.

## Common error messages and what they mean

- **Error: Running LUA method 'update'/'draw':** Script error in a mod — read the culprit from the call stack.
- **Warning: ... is not defined / nil value:** The mod expects something that's missing (often after a game update).
- **Error: Can't load resource / file not found:** A mod file is missing or corrupted — re-upload the mod.
- **Error running specialization:** Two mods are clashing or a mod is incompatible with the game version.

**Warning vs. Error:** Plain `Warning` lines are often harmless and don't affect the game. Only `Error` entries — especially with a "LUA call stack" — point to real problems.

## If nothing helps

If the error persists despite up-to-date mods, check: is the correct FS25 version running on the server? After a game update, several mods often need updating at the same time. Back up your savegame via FTP first — if a mod has left objects in your save, removing it can delete them.

## Frequently asked questions (FAQ)

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## Frequently asked questions

**Q: What does 'Error: Running LUA method' mean in FS25?**
A: A script error from a mod. The function (e.g. update or draw) is just the symptom — the culprit appears in the 'LUA call stack' as a mod folder name in the path (e.g. FS25_ExampleMod).

**Q: How do I find out which mod causes the LUA error?**
A: Search the server log for 'LUA call stack'. The path contains /mods/FS25_XXXX/ — that's the mod throwing the error.

**Q: Are LUA errors always critical?**
A: Not always. Some just stop one feature and spam the log, others crash the server. Pure 'Warning' lines, on the other hand, are usually harmless.

**Q: How do I fix a LUA error permanently?**
A: Usually updating the mod to the latest version helps. If there's no update, remove the mod or replace it with a maintained alternative.

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## About this guide

This guide was written by the Agrar Chaoten community.

*Source: https://agrarchaoten.com/en/guides/ls25-lua-fehler-server*
*Agrar Chaoten — https://agrarchaoten.com*