The message is a "placeholder error," which happens when the game's code calls for a specific piece of text—like the name of a location or a pawn—but can't find it, so it just gives up and shows the raw code instead. The example from the official Ludeon forums is a perfect case: a player received a quest whose name was displayed as ERR: [Joiner_nameDef]'s [site/site_label] . This guide will cover the four main causes of this error and provide a step-by-step troubleshooting plan to get your colony back on track.
Launch RimWorld and open the from the main title panel.
This is the most common culprit. When two or more mods clash, especially those that add new quests, factions, or world map generation, they can prevent the quest system from functioning correctly.
PSA: How to fix the broken "ERR: [Site_label]" quest log bug If you're seeing ERR: [Site_label] [detected] rimworld err site label detected new
The fix? Manually editing the Languages/English/Keyed/Sites.xml file in the mod folder to add: <SiteDef.SauridNest.discovered>Discovered Nest</SiteDef.SauridNest.discovered>
: If your mod list is deeply tangled, reset it entirely by deleting your ModsConfig.xml file located in your AppData directory ( LocalLow\Ludeon Studios\RimWorld by Ludeon Studios\Config ). This forces the game to start cleanly with only Core and official DLCs active. Summary of Fixes Problem Level Primary Cause Best Fix Strategy Single Active Save Missing mod elements / Corrupted quest queue Force delete via Dev Mode or edit the .rws file. All New Games Faulty load order / Overwriting XML patches Re-sort with a mod manager or clear ModsConfig.xml . Vanilla Game Engine Corrupted localized text files Run Verify Integrity of Game Files via Steam. Vanilla Bug or Mod Bug? Quest-Generation fails
: Removing a mod that adds specific world sites or quest locations causes the game to look for text anchors that no longer exist. The message is a "placeholder error," which happens
: Use the search function (Ctrl+F) with "Enable case sensitivity" to find the specific ERR:[Site_label] Delete the Entry : Locate the
The "err site label detected new" error in RimWorld commonly indicates a data conflict, often caused by mods adding new locations, factions, or quest sites. It occurs when the game engine cannot properly render a site label, typically due to outdated mods or mid-save changes. Resolving this issue usually involves updating mods, clearing the configuration cache, or checking for mod conflicts with a tool like RimPy. For further technical support, consult the Ludeon Studios forums.
The "ERR: [Site_label] [detected]" error in is a common indicator of a corrupted quest entry or a broken world map reference Launch RimWorld and open the from the main title panel
In RimWorld , the game constantly generates events. Many of these events take place off-map, requiring the creation of a "site" on the world map. This site needs a name, a description, and a site label (e.g., "Bandit Camp", "Ancient Lab").
Now that we've covered the possible causes, let's dive into the solutions. Follow these steps to fix the "ERR Site Label Detected New" error:
If you don't want to dig into code files, you can use RimWorld's built-in developer tools to clear or force-complete the broken event. Main Menu ➔ Options ➔ Development Mode (Toggle On)
In a 100% vanilla installation of RimWorld, you will almost never see this error. If you do, it usually indicates a corrupted game cache. However, for the other 99.9% of users, this is a or a Broken Def .
: Modded world sites often require underlying frameworks like HugsLib or Harmony . If these are missing or out of order, generation fails.