WP All Import can't read your file.<br/><br/>Probably, you are trying to import an invalid XML feed. Try opening the XML feed in a web browser (Google Chrome is recommended for opening XML files) to see if there is an error message.<br/>Alternatively, run the feed through a validator: http://validator.w3.org/<br/>99% of the time, the reason for this error is because your XML feed isn't valid.<br/>If you are 100% sure you are importing a valid XML feed, please contact WP All Import support.