Why Mods Do Not Load or Appear in the Game?

When MelonLoader mods do not show up in the game, fail to load, or simply do nothing, there are a few common causes. Most issues come from wrong folder placement, incorrect versions, missing dependencies, or using unsupported game builds.

This guide includes all major reasons and the exact steps to fix them.

Mods Are in the Wrong Folder

This is the most common problem.

Correct folder structure:

  • GameFolder
    • Mods
    • Plugins
    • UserData
    • MelonLoader
    • MelonLoader.dll
    • UnityPlayer.dll (modified by MelonLoader)

Common mistakes:

  • Mods placed inside a folder named Mod instead of Mods
  • Mods placed inside GamesFolder\Mods\AnotherFolder
  • Mods placed in Plugins instead of Mods
  • Zip files not extracted
  • Wrong game directory selected

Fix:

  • Place all mod .dll files directly inside the Mods folder
  • Do not create sub folders
  • Make sure you are editing the correct game folder

The Mod Is Not Compatible With Your MelonLoader Version

Older mods may not work with newer MelonLoader builds.

Signs of incompatibility:

  • Mod never loads
  • No errors appear in game
  • Latest.log shows MissingMethodException
  • Latest.log shows Unsupported Melon
  • Mod requires a different MelonLoader version

Fix:

  • Update MelonLoader using the official installer
  • Download the latest version of the mod
  • Remove old or outdated mods
  • Test mods one by one

The Mod Is Built for a Different Game

Mods are game specific.

Problem examples:

  • A BTD6 mod will not load in another Unity game
  • A VRChat mod will not load in Bonelab
  • A mod for Steam version will not work in Microsoft Store version

Fix:

  • Check the mod description
  • Make sure the mod is made for your exact game
  • Download the correct mod version

The Game Updated and Broke the Mods

When a game updates:

  • UnityPlayer.dll changes
  • Game logic changes
  • Old mods may no longer match the code
  • MelonLoader may need to reinstall

Symptoms:

  • Mods suddenly stop working
  • No mods appear in MelonLoader console
  • Latest.log shows errors
  • Game crashes before loading mods

Fix:

  • Reinstall MelonLoader using official installer
  • Check for updated mod versions
  • Remove broken or outdated mods
  • Roll back the game if the game platform supports it

Wrong Game Version (Steam, Epic, Microsoft Store, Region)

Some game versions do not support MelonLoader injection.

Common issues:

  • Microsoft Store and Game Pass versions block modding
  • Epic version may use different file naming
  • Region locked builds behave differently
  • Linux or Mac versions cannot load MelonLoader at all

Fix:

  • Use the Windows Steam version for best compatibility
  • Make sure the mod supports your launcher version
  • Avoid Microsoft Store and Game Pass builds

Missing Dependencies Required by the Mod

Some mods need additional files to run.

Dependency examples:

  • Extra .dll files
  • Plugins folder files
  • Config files
  • External libraries

How to check:

  • Open Latest.log
  • Look for messages like
    • Could not load assembly
    • Missing dependency
    • Failed to resolve type

Fix:

  • Read the mod installation instructions
  • Download all required dependency files
  • Place dependencies exactly where the mod author instructs

Antivirus or Windows Security Blocking the File

Windows may block downloaded .dll mods.

Symptoms:

  • File is blocked
  • Mod appears as zero bytes
  • Mod is ignored by MelonLoader
  • Mods fail without error

Fix:

  • Right click the mod file
  • Open Properties
  • Enable Unblock if available
  • Add your game folder to antivirus exceptions

Mod Is Still in a Zip or Rar File

Mods must be fully extracted before use.

Common mistakes:

  • Placing the zip file inside Mods
  • Extracting only part of the mod
  • Extracting into a double folder layer

Fix:

  • Fully extract the downloaded mod
  • Move .dll files into the Mods folder
  • Do not keep mods inside zip files

You Downloaded a Mod for a Different Mod Loader

Not all mods are MelonLoader mods.

Examples of wrong formats:

  • BepInEx mods
  • LemonLoader mods
  • REFramework mods
  • IPA mods
  • Standalone Unity patches
  • Custom game patchers

Fix:

  • Confirm the mod title says MelonLoader
  • Download the correct mod type
  • Use the correct mod loader for that mod

Latest.log Shows an Error Explaining the Problem

The Latest.log file tells you exactly what went wrong.

Location:

  • GameFolder
    • MelonLoader
      • Latest.log

Common log errors:

  • Failed to load assembly
  • Incompatible melon
  • Missing local method
  • Dependency missing
  • Version mismatch
  • Unsupported game version
  • Mod failed to initialize

Fix:

  • Update MelonLoader
  • Update the mod
  • Install missing dependencies
  • Remove broken mods
  • Test one mod at a time

Game Needs Administrator Permission

Some games block file injection unless you have permission.

Symptoms:

  • Mods not loading
  • Config errors in log
  • Mod writes fail

Fix:

  • Run the game as administrator once
  • Avoid installing games inside Program Files
  • Move the game to a custom folder

Final Fix Checklist

Use this checklist to solve 99 percent of mod loading issues.

  • Mods are extracted
  • Mods are inside the Mods folder
  • No sub folders
  • Correct game version
  • Correct mod version
  • Latest MelonLoader installed
  • No antivirus blocking
  • All dependencies installed
  • Old mods removed
  • Config files not corrupted
  • Game is Windows version
  • No Mac or Linux builds
  • Check Latest.log for errors
  • Test mods one by one

Download Links

Official MelonLoader website
https://melonloader.pro

Official installer download
https://melonloader.pro/download-melonloader/

Official GitHub
https://github.com/LavaGang/MelonLoader