On Windows operating systems, this tool always attempts to convert folder paths to short-name (8.3 compliant) format. Because of the conversion, you don't normally need to specify paths in the short-name format. This error indicates that something happened to prevent the conversion from succeeding.
Use 8.3-compliant paths for the parameters of this tool. Keep the total path length fewer than 122 characters. Make sure that each folder name in the path is eight characters or shorter. Avoid using spaces and other special characters, such as a plus sign (+), equal sign (=), and left bracket ([).