Folder name is too long. The complete folder path must be less than 260 characters.
You're trying to add a new folder or rename an existing folder in a Web project, and the folder name (with path) is 260 characters or greater.
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To correct this error, use a shorter name for the project. You may need to revise your folder structure if the path name is too long.
For more information, see Reorganizing Project Structure.