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The file 'file' could not be added to the project. <reason> 

A file that has been read from the .vbproj or .csproj file cannot be added to the project. Reasons include:

  • Invalid file name.

  • File within a path. For example, if you have a project-relative path of File1\File2.txt, but there is also a folder with relative path File1\File2.txt.

  • Item already exists. This occurs when a file is listed twice in the project file.

  • Link already exists. The Visual Basic and Visual C# project system has a limitation in that there can only be one link with the same name per project. This means, for example, that you cannot have a link to file.vb in both folder A and folder B of the project.

This error is most likely caused by editing the project file by hand.

Any file for which this diagnostic is displayed will not be added to the project.

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