Mod Troubleshooting Guide

Having trouble with one of my mods? Don’t worry, most issues are easy to fix. Follow this guide step by step before reporting a bug.

🔹 1. Make Sure Your Game Is Ready

• Enable Script Mods and Custom Content in your game options.
  (These settings are usually turned off after big game updates, so always double-check.)

• Restart the game after enabling them.

🔹 2. Check Your Mod Folder

• Make sure the files are not nested too deep. Mods should be within 5 folders deep max. Example: Mods/UTOPYA_MODS/ Mod_file.package ✅

• Remove old versions. Only keep the latest download.

• If the mod includes a .ts4script file, it must be placed directly in the Mods folder (or only one sub-folder deep). Scripts placed too deep will not load.

🔹 3. Clear Cache Before Testing

• Always clear cache after updating mods:

• Make sure to close the game

• Go to: Documents › Electronic Arts › The Sims 4

• Delete localthumbcache.package

• Delete everything inside cache and cachestr

• Delete onlinethumbnailcache if present

• Restart the game so fresh files regenerate

🔹 4. Required Files & Dependencies

• Some mods need Lot51’s Core Library or Xml Injector. Make sure you:

  • Have the required dependency installed.

  • Have the latest version of it.

🔹 5. Conflicts & Load Order

• Some merged mod packs may contain outdated versions of my mods, which cause conflicts.

• Test with a clean Mods folder: only Lot51 Core Library or XML Injector + the UTOPYA mod.

• If it works on its own, another mod/CC is conflicting. Add your other mods back in small groups to find the one causing the conflict.

🔹 6. Common Fixes

• Interaction not showing up? Make sure you’re using the correct UTOPYA objects. EA versions or unrelated CC won’t work.

• Some interactions require conditions (first kiss, relationship level, skill level, etc). Read the mod description for details.

• Objects missing in Build/Buy? Search the keyword (e.g., “Rental” for eBike Station) or check Outdoor Activities if you don’t see the Transport tab in base game.

• Some mods include a separate object package — make sure you installed it.

• Buffs or effects missing? Clear cache (localthumbcache.package) and restart. Old data can block new buffs.

• Bike/prop disappearing after traveling? Items return to inventory unless sold. Check your Sim’s inventory first.

• Missing text? Usually caused by a missing string for your language. Comment it below so I can fix it.

• Llama icon showing? Happens when a custom icon doesn’t load. Mention it below so I can update it.

🔹 7. Test With a New Save

Sadly, after each new Sims update, save corruption becomes more common, especially with large Mods folders. If you’ve already tried steps 5 and 6 and the mod still isn’t showing up, test it alone in your Mods folder (with its dependency) on a fresh news save

• Back up your saves

• Create a fresh test save and try the mod there

• If it works in the new save, the issue may be with your old one

🔹 8. After a Patch

• Big Sims 4 updates often break mods. If something stops working after a patch, check my Master Mod Index post (Coming Soon).

• Most of my mods do not use scripts, so they usually survive patches fine.

• Always make sure dependencies (Lot51’s Core Library / XML Injector) are updated. If they aren’t updated yet, wait until they are.

🔹 9. Still Not Working?

If you’ve tried all of the above and the problem is still there, you can:

• Comment below this post with details about the problem.

• Be specific (“interaction not showing up,” “object not in Build/Buy”) so I can understand what’s happening.

• Please do not comment unless you’ve gone through every step in this guide; most issues are solved here already.

⚠️ Before commenting about a bug

Again, read this guide fully and follow the steps. As I said, Most issues people report are caused by:

• Not updating dependencies (Lot51’s Core Library / XML Injector)

• Old versions of the mod still in your Mods folder

• Cache not cleared after updating

Nine times out of ten, these steps fix the issue. If you skip them, I won’t be able to help until you’ve tried them first.

The Master Mod Index post is coming soon!