Could not get URL after 3 tries.
From semantic-mediawiki.org
Fragment of a discussion from Help talk:Repairing SMW's data
This was actually never answered. I just ran into this too. This comes from the External Data extension unsuccessfully trying to fetch data from the external source, which is no longer there. See system message "externaldata-db-could-not-get-url". Thus this has nothing to do with SMW. I just pops up during the data rebuild since the respective pages are being parsed.
