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Copy file name to clipboardExpand all lines: docs/msbuild/errors/msb3103.md
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---
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title: "MSB3103: Invalid Resx file"
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description: "This error occurs when there's an issue with a .resx resource file."
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ms.date: "06/18/2021"
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ms.date: "1/27/2025"
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ms.topic: "error-reference"
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f1_keywords:
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- MSB3103
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---
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# MSB3103: Invalid Resx file
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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.
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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.
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## Message text
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`MSB3103: Invalid Resx file`
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## Remarks
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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.
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## Common Causes
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This error can occur in the following scenarios:
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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.
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- Example: A file path specified in the `.resx` is incorrect or points to a missing file.
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2.**Incorrect type reference**: The `.resx` file referenced a type that couldn't be found.
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- Example: A typo in a type reference in a ResXFile reference, or a type that was not available for some reason.
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3.**Corrupted files**: The `.resx` file or one of its dependencies was corrupted.
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## Real-World Scenarios
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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.
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2.**Manual edits to `.resx` files**: Someone manually editing `.resx` files might inadvertently introduce syntax errors or invalid data.
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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.
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4.**Corrupted `.resx` files**: Files can become corrupted due to version control conflicts or file encoding changes.
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### Resolution
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1.**Check Resource Entries**:
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- If external resources are referenced, verify their paths and existence.
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2.**Use the ResX Resource Manager**:
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- Consider using tools like [ResX Resource Manager](https://github.com/dotnet/ResXResourceManager) to validate and manage `.resx` files.
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3.**Update for Framework Compatibility**:
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- Review changes in resource handling for the target framework.
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- Update `.resx` files to align with the requirements of the new framework.
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4.**Revert to a Known Good State**:
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- If the `.resx` file has become corrupted, revert to a previous version from source control.
Copy file name to clipboardExpand all lines: docs/msbuild/errors/msb3202.md
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title: "MSB3202: The project file 'filename' was not found."
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description: "This error occurs when MSBuild can't find a project file with the specified name at the expected location."
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ms.date: "08/15/2022"
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ms.date: 1/21/2025
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ms.topic: "error-reference"
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- MSB3202
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MSB3202: The project file 'filename' was not found.
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```
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Make sure the current directory is correct and that the specified project file exists and that the filename is spelled correctly.
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## Remarks
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The MSB3202 error occurs when MSBuild is unable to locate the specified project file. This error is generated when a build is invoked with an incorrect or missing project file path, or incorrect or missing dependent project file.
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## Common causes
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Here are some real-world scenarios that can lead to this error, especially in modern development and CI/CD environments:
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1.**Incorrect file path in command line or build script**
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- When invoking MSBuild, the specified project file path doesn't exist or is mistyped. Check the path, especially for syntax issues such as quotes around paths with spaces.
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2.**Project file renamed or deleted**
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- A project file was renamed or removed from the repository, but the build logic or one of the build inputs was not updated to reflect this change.
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3.**Repository checkout issues**
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- During a CI/CD pipeline execution, the source code repository might not be fully checked out, or the necessary project file is excluded due to `.gitignore` rules or shallow cloning.
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## Resolution
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1. Verify that the project file exists at the specified location.
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- Use an absolute path to the project file to avoid ambiguity.
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- Example:
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`msbuild C:\Projects\MySolution\MyProject.csproj`
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2. Check for typos in the ProjectReference item in the project file.
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3. Ensure your version control system includes all necessary project files and that the repository checkout is complete.
Copy file name to clipboardExpand all lines: docs/msbuild/errors/msb3245.md
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title: "MSB3245: Could not resolve this reference. 'assembly' If this reference is required by your code, you may get compilation errors."
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description: "This diagnostic code is emitted when MSBuild can't find an assembly referenced in your project."
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ms.date: "08/15/2022"
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ms.date: 1/21/2025
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ms.topic: "error-reference"
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The full message resembles the following text:
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```output
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MSB3245: Could not resolve this reference. 'assembly' If this reference is required by your code, you may get compilation errors.
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```
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`MSB3245: Could not resolve this reference. 'assembly' If this reference is required by your code, you may get compilation errors.`
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This error might occur if the item is a directory, not a file, or it could occur if the assembly resolver for that reference returns an error. It could be any error that prevents resolution of the reference, such as a missing assembly, misspelled name, version mismatch, mismatched processor architecture, or failed `ProjectReference`.
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For a guide on resolving errors with assembly references, see [Troubleshoot assembly references](../troubleshoot-assembly-references.md).
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For a guide on resolving errors with assembly references, see [Troubleshoot assembly references](../troubleshoot-assembly-references.md).
The error code MSB3248 occurs in the `ResolveAssemblyReference` task in MSBuild when there's an issue with the parameters specified for resolving assembly references. The `ResolveAssemblyReference` task is responsible for resolving assembly references in a project. You don't normally invoke this task directly; it's called during the .NET build process.
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### Common causes
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The most likely cause is an MSBuild property setting that creates an issue with the assembly resolution process. See [Common MSBuild properties](../common-msbuild-project-properties.md).
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## Resolution
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Look at what specific parameter triggers the error and its value and review how it's set or modified in your project files or imported files.
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Enable detailed logging for your MSBuild process by using the `/v:diag` verbosity flag:
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```bash
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msbuild MyProject.proj /v:diag
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```
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This option provides a detailed log output, which should be helpful to determine which assembly reference is triggering the issue. Then, check the values of the properties that are related to that assembly, and the project that references it.
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You can also create a binary log by using the `-bl` command-line option, and use MSBuild [structured log viewer](https://msbuildlog.com/) to more easily view the log output. For more information, see [Troubleshoot assembly references](../troubleshoot-assembly-references.md).
The error MSB3249 is raised by the `ResolveAssemblyReference` task in MSBuild when an invalid or malformed application configuration file (for example, `app.config`) is detected during the build process. This usually occurs when the configuration file contains syntax errors, invalid XML, or unexpected values that prevent MSBuild from properly resolving assembly references. See [ResolveAssemblyReference task](../resolveassemblyreference-task.md).
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### Possible causes
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1.**Malformed or invalid XML**: The `app.config` file contains syntax errors or is not well-formed XML.
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2.**Missing or incorrect `<runtime>` section**: The `app.config` file is missing the `<runtime>` element or contains invalid data in this section. See [`<runtime>` element](/dotnet/framework/configure-apps/file-schema/runtime/runtime-element).
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3.**Unrecognized configuration settings**: The file includes settings that are not supported or are incorrectly specified.
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4.**File not accessible**: The `app.config` file is missing, locked, or inaccessible due to file permissions.
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### Resolution
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1.**Validate the `app.config` file**:
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- Open the file in an XML editor or IDE that supports XML validation.
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- Correct any syntax errors or invalid XML structure.
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2.**Check for unsupported or invalid settings**:
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- Review the file for any unrecognized configuration keys or invalid values.
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- Refer to the [Configuring apps by using configuration files](/dotnet/framework/configure-apps/) for supported settings.
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3.**Ensure file accessibility**:
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- Confirm that the `app.config` file exists in the expected location.
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- Ensure the build process has the necessary permissions to read the file.
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The `ResolveAssemblyReference` task is responsible for resolving references to assemblies during the build process. An invalid `app.config` file can prevent this task from completing successfully. For more information on the `ResolveAssemblyReference` task, see [MSBuild ResolveAssemblyReference Task](../resolveassemblyreference-task.md).
This error occurs when MSBuild encounters an XML attribute in a project file or target file that it doesn't recognize. MSBuild validates the attributes of elements in project files to ensure they adhere to the correct MSBuild syntax and supported attributes for each element.
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## Possible causes
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The error is typically caused by one of the following:
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- A typo in an attribute name within an MSBuild project file (for example, `.csproj`, `.vbproj`, or `.proj`).
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- Use of an unsupported or obsolete attribute in a project file.
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- An attribute was added to the project file but isn't recognized by your version of MSBuild.
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## Resolution
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1.**Check for typos**: Verify that the attribute name is spelled correctly and matches the expected schema.
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2.**Remove unsupported attributes**: Cross-reference the MSBuild documentation to ensure that the attribute is valid for the specific element. See [MSBuild project file schema reference](../msbuild-project-file-schema-reference.md).
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3.**Update MSBuild version**: If the attribute is new and not recognized, ensure you're using a version of MSBuild that supports it.
Copy file name to clipboardExpand all lines: docs/msbuild/errors/msb4186.md
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title: "MSB4186 diagnostic code"
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description: "Invalid static method invocation syntax: 'value'. 'value' Static method invocation should be of the form: $([FullTypeName]::Method()), e.g. $([System.IO.Path]::Combine(`a`, `b`)). Check that all parameters are defined, are of the correct type, and are specified in the right order."
UE: This message is shown when the user attempts to call a static method on a type, but has used the incorrect syntax
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LOCALIZATION: "{0}" is the function expression which is in error. "{1}" is a message from an FX exception that describes why the expression is bad.
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-->
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## Remarks
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This error occurs when MSBuild encounters a function invocation that uses an invalid syntax for calling a static method. In MSBuild, static methods must be invoked using the correct syntax: `$([FullTypeName]::Method(Parameters))`.
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### Resolution
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To resolve this error, ensure that the static method is invoked using the proper syntax, including the closing `]` and the `::`:
This error occurs when a target in an MSBuild project file attempts to use a property that wasn't initialized at the point it was used, but it's assigned a value later in the build process.
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It's not an error to use an uninitialized property. Such an undefined property simply gets the empty string as a value, but if the property is later assigned a value, this error occurs.
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If you want MSBuild to warn for any uninitialized property, set the environment variable `MSBUILDWARNONUNINITIALIZEDPROPERTY` to 1.
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## Resolution
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To resolve this error, ensure that the property in question is initialized before you use it. Since the property is given a value later, you might need to change the sequence of property settings or imports to ensure that the initialized occurs before reading the property's value.
%(RootDir) to an item-spec that's not a valid path would result in this error.
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LOCALIZATION: "{1}" is a localized message explaining the problem.
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## Remarks
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The MSB4248 error occurs when MSBuild is unable to expand item metadata in a build operation. This situation typically happens when metadata references are used in an invalid context or when the metadata being referenced doesn't exist for the item.
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## Possible causes
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This error can be raised for the following reasons:
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1.**Metadata not supported for the item**
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For example, referencing %(RootDir) on an item that isn't a path.
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1.**Dynamic item metadata in complex builds**
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- Dynamically generated item metadata may not always be available, depending on the build configuration.
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## Resolution
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1.**Validate that the requested metadata is consistent with the item.**
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1.**Conditionally access metadata**
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- For dynamic builds, ensure metadata is accessed conditionally to avoid referencing undefined metadata:
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