A built output from another project with the name file already exists in the folder name.

You are trying to add a built output file to a folder in your Web project and a built output file with the same name from another project or the same project already exists in the folder. Built outputs come from other applications such as Microsoft^® Visual J++™, and can be added to your Web project. This error occurs while the file is being built.

• To correct this error, add the built output file to a different folder.

For more information, see Build a Package.