I’m having the same issue. I migrated my levels and files to an empty project to clean up some corrupt plugin data, which worked beautifully. However, now I’m getting warnings from files that existed in the old project but were deleted before migrating and I’m not sure where they’re being referenced:
UATHelper: Packaging (Windows (64-bit)): LogCook: Display: Cooking /Game/Neurorama/Core/Player/TestingVR/BP_VR_Flypawn -> C:/Users/me/Documents/GitHub/Neurorama/Saved/Cooked/WindowsNoEditor/Neurorama/Content/Neurorama/Core/Player/TestingVR/BP_VR_Flypawn.uasset
UATHelper: Packaging (Windows (64-bit)): LogSavePackage: Display: Finished SavePackage C:/Users/me/Documents/GitHub/Neurorama/Saved/Cooked/WindowsNoEditor/Neurorama/Content/Neurorama/Core/Player/TestingVR/BP_VR_Flypawn.uasset
UATHelper: Packaging (Windows (64-bit)): LogLinker: Warning: Can't find file '/Game/Neurorama/MaterialLibrary/M_TextMaterial_Emissive'
PackagingResults: Warning: Can't find file '/Game/Neurorama/MaterialLibrary/M_TextMaterial_Emissive'
UATHelper: Packaging (Windows (64-bit)): LogUObjectGlobals: Warning: Failed to load '/Game/Neurorama/MaterialLibrary/M_TextMaterial_Emissive': Can't find file '/Game/Neurorama/MaterialLibrary/M_TextMaterial_Emissive'
PackagingResults: Warning: Failed to load '/Game/Neurorama/MaterialLibrary/M_TextMaterial_Emissive': Can't find file '/Game/Neurorama/MaterialLibrary/M_TextMaterial_Emissive'
UATHelper: Packaging (Windows (64-bit)): LogLinker: Warning: Can't find file for asset '/Game/Neurorama/MaterialLibrary/M_TextMaterial_Emissive' while loading C:/Users/me/Documents/GitHub/Neurorama/Content/Neurorama/Core/Player/TestingVR/BP_Flypawn_VR.uasset.
PackagingResults: Warning: Can't find file for asset '/Game/Neurorama/MaterialLibrary/M_TextMaterial_Emissive' while loading C:/Users/me/Documents/GitHub/Neurorama/Content/Neurorama/Core/Player/TestingVR/BP_Flypawn_VR.uasset.
…etc