Request Exception

There was an ambiguous exception that occurred while trying to request and download this URL. Often this points to a DNS lookup failure. Could not resolve the hostname to an IP.

Invalid URL

The robot tried and failed to download a document using a URL that was malformed. An attempt has been made to sanitize discovered URLs, but hey, nobody’s perfect.

Missing Schema

The robot tried and failed to download a resource from a location without a protocol or with a mangled protocol. An attempt has been made to have the robot append ‘http://’ to schema-less URLs, but it is still possible to get this error.