This error occurs when image files are being uploaded from a .csv file, and the image files are not served from an FTP site.  If the image file is already served from an FTP site, ensure that the file name is correct. The file must be placed into the file path that follows the "source file path does not exist" section of the error.

Note
You need an FTP client, such as FileZilla, to upload files to an FTP site.