Errors caused by the update

Development Platform & Builds
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A project that was working until around August last year now shows errors when opened in the current version.

Errors include:

  • “Failed to use dependent package while attempting to load.”
  • “Failed to load referenced source during asset check.”

Example error messages:

  • “Failed to use dependent package /Game/Athena/Artemis/Environments/BuildingActors/Foliage/B_Artemis_StealthGrass_Creative while attempting to load. Additional information:
    FPackageName: Skipped package /Game/Athena/Artemis/Environments/BuildingActors/Foliage/EditorStealthGrassIcon has a valid, mounted mount point but does not exist either on disk or in iostore. The uncooked file would be expected on disk at 'C:/Program Files/Epic Games/Fortnite/FortniteGame/Content/Athena/Artemis/Environments/BuildingActors/Foliage/EditorStealthGrassIcon'. Perhaps it has been deleted or was not synced?”
  • “Failed to load referenced source /Engine/Functions/Engine_MaterialFunctions02/Utility?MakeFloat2 during verification.”

Possible Causes and Solutions:

  1. Missing or Deleted Files:
  • Some required files may have been deleted or not properly synced. Check if they exist in the specified directory.
  • If using version control (e.g., Perforce, Git), try syncing missing files.
  1. Engine Version Compatibility:
  • If the project was created in an older version of the engine, some assets may be incompatible with the current version.
  • Try opening the project in the original version and re-saving assets before upgrading.
  1. Corrupted or Misconfigured Dependencies:
  • If assets reference missing or corrupted dependencies, errors can occur. Try using “Fix Up Redirectors” in the Content Browser.
  • In Unreal Editor, go to File → Refresh All Assets and Validate Assets.
  1. Missing or Incorrectly Mounted Content:
  • If the error mentions “mount point” issues, verify that all necessary plugins and content packs are installed and enabled.
  • Check Config/DefaultGame.ini for incorrect mount points.
  1. Cache Issues:
  • Delete the project’s Intermediate, DerivedDataCache, and Saved folders, then restart the engine.
  • If using a launcher version of Unreal Engine, try verifying the engine installation.

Would you like specific instructions on any of these steps?

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