MaterialInstance.cpp could not be found

Development Programming & Scripting
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Problem Explanation

When running the Unreal Engine project, a breakpoint is triggered in BgScriptReader.cs. The shared call stack indicates that the issue occurs during the loading of a UMaterialInstance object, specifically in the PostLoad function. This process is part of Unreal Engine’s package and map loading system.

Details from the Call Stack

  • The UMaterialInstance::PostLoad() function executes, and a lambda function is called, causing the breakpoint to trigger.
  • The process involves LoadPackage and Map_Load, which are responsible for loading maps in Unreal Engine.
  • The issue arises during the editor initialization process (EditorInit).

This could be caused by:

  1. Corrupted or Misconfigured Material Settings:
  • The UMaterialInstance object may reference missing or incompatible assets, causing an error during the PostLoad process.
  1. Faulty Plugin or Script:
  • The BgScriptReader.cs file might belong to a plugin or custom script that is interfering with the material loading process.
  • Misconfiguration or incompatibility of the plugin/script could trigger this issue.
  1. Corrupted Project Files:
  • There might be issues with the map, material, or related assets, such as broken references or corrupted files.

Solutions

1. Examine the Code in BgScriptReader.cs

  • Open the file and investigate the line where the breakpoint triggers.
  • Review the output log to gather more details about the error.

2. Verify Material Settings

  • Check the materials, textures, or shaders referenced by the project.
  • Specifically, review the UMaterialInstance and UMaterialInstanceConstant objects mentioned in the call stack. Ensure there are no missing or corrupted assets.

3. Update Plugins and Dependencies

  • If BgScriptReader.cs belongs to a plugin, ensure the plugin is up-to-date and compatible with your version of Unreal Engine.
  • If an update isn’t available, consider reverting to an earlier, stable version.

4. Clean Temporary Project Files

  • Clear Unreal Engine’s temporary files to rebuild project data:
    • In your project directory, delete the Intermediate and Saved folders.
    • Rebuild the project using the Unreal Editor or your IDE.

5. Change the Default Map

  • The call stack references FEditorFileUtils::LoadDefaultMapAtStartup(). Try setting a different default map in your project settings to determine if the issue is tied to a specific map.

6. Adjust Debugging Settings

  • If you want to skip external scripts like BgScriptReader.cs during debugging, enable the “Just My Code” option in Visual Studio under Debugging > Options > General. This will ensure the debugger focuses only on your project code.

7. Search Unreal Engine Forums

  • If the issue persists, search the Unreal Engine forums for similar issues using keywords like UMaterialInstance::PostLoad or BgScriptReader.cs. You might find a solution or related discussion.

Conclusion

Start by analyzing the code in BgScriptReader.cs to identify why the breakpoint triggers. Clean the project files, ensure your plugins and assets are up-to-date, and test whether the problem is tied to a specific map or material. If the issue continues, adjust debugging settings to bypass external code, or consult Unreal Engine community forums for further assistance.