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MSB3103: Invalid Resx file

  • บทความ

This error occurs when there/s an issue with a .resx resource file. When you see this error, another error is displayed with more details. Look to the other error for more information.

Message text

MSB3103: Invalid Resx file

Remarks

The error MSB3103 occurs when MSBuild encounters an invalid .resx file during the build process. This error indicates that the .resx file can't be properly read or processed, often due to incorrect file paths or references.

Common Causes

This error can occur in the following scenarios:

  1. Missing or Inaccessible Resources: The .resx file references external resources (for example, images or files) that aren't present in the expected location or are inaccessible.
    • Example: A file path specified in the .resx is incorrect or points to a missing file.
  2. Incorrect type reference: The .resx file referenced a type that couldn't be found.
    • Example: A typo in a type reference in a ResXFile reference, or a type that was not available for some reason.
  3. Corrupted files: The .resx file or one of its dependencies was corrupted.

Real-World Scenarios

  1. Migrating projects: When you're upgrading a legacy project from .NET Framework to .NET Core or .NET 6+, existing .resx files may contain elements or attributes that are incompatible with the newer frameworks.
  2. Manual edits to .resx files: Someone manually editing .resx files might inadvertently introduce syntax errors or invalid data.
  3. Broken resource links: Referencing external files (for example, images or icons) in .resx files without ensuring these files are included in the project or accessible during the build.
  4. Corrupted .resx files: Files can become corrupted due to version control conflicts or file encoding changes.

Resolution

  1. Check Resource Entries:

    • If external resources are referenced, verify their paths and existence.

  2. Use the ResX Resource Manager:

  3. Update for Framework Compatibility:

    • Review changes in resource handling for the target framework.
    • Update .resx files to align with the requirements of the new framework.

  4. Revert to a Known Good State:

    • If the .resx file has become corrupted, revert to a previous version from source control.

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