This error generally stems from the game being unable to correctly pull a name or label from its database (Defs) for a world-site object. Primary causes include: Modding Tutorials/Troubleshooting - RimWorld Wiki
Update, reorder, or completely unsubscribe and resubscribe to that specific mod to repair it. Managing the Broken Quest on Active Saves Vanilla Bug or Mod Bug? Quest-Generation fails
Open the (the top-left icon that looks like a sheet of text).
After investigating various player reports and forum discussions, we've identified some possible causes of the error:
: If this is happening on a fresh install or new game, use Steam's Verify Integrity of Game Files tool to ensure no core files are missing.
: Use a text editor like Notepad++ to open the .rws save file.
: Occasionally, Local Preference XML config files corrupt over time, preventing the base game from parsing location nodes correctly. Quick Fixes for Active Games
: If the error only appears in the quest log, you can try to simply delete the quest without accepting it. Troubleshooting "Deep" Errors Vanilla Bug or Mod Bug? Quest-Generation fails
The error is a common glitch in RimWorld that breaks world map generation, causing text fields in your quest log to display raw code snippets like ERR: [Site_Label] [detected] or ERR: You've detected a [siteLabel] nearby .