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This article describes the MSB3103 error code.
Message text
MSB3103: Invalid Resx file.
Description
This error occurs when there's an issue with a .resx resource file. This error indicates that the .resx file can't be properly read or processed, often due to incorrect file paths or references.
Common causes
The following causes can result in this error:
| Cause | Description | Example |
|---|---|---|
| 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. |
A file path specified in the .resx file is incorrect or points to a missing file. |
| Incorrect type reference | The .resx file referenced a type that can't be found. |
A typo in a type reference in a ResXFile reference, or a type that isn't available for some reason. |
| Corrupted files | The .resx file or one of its dependencies is corrupted. |
The .resx file contains unreadable characters and the build isn't able to process the file. |
Real-world scenarios
Here are some real-world scenarios that can lead to this error:
Project migration: Upgrading a legacy project from .NET Framework to .NET Core or .NET 6+ where existing
.resxfiles contain elements or attributes that aren't compatible with the newer frameworks.Manual edits to .resx files: Manual edits to
.resxfiles that inadvertently introduce syntax errors or invalid data.Broken resource links: References to external files (for example, images or icons) in
.resxfiles where the files aren't included in the project or accessible during the build.Corrupted .resx files: Files are corrupted due to version control conflicts or file encoding changes.
Resolution
Check resource entries: If external resources are referenced, verify their paths and existence.
Use the ResX Resource Manager: Consider using tools like ResX Resource Manager to validate and manage
.resxfiles.Update for framework compatibility: Review changes in resource handling for the target framework. Update
.resxfiles to align with the requirements of the new framework.Revert to a known good state: If the
.resxfile is corrupted, revert to a previous version from source control.
For more information, see MSBuild Documentation and ResX Resource Manager.
Applies to
All versions of MSBuild