the widar oauth tool is broken:
This means people can't authenticate at Wikidata The Game and other tools using widar.
The URI you have requested, /widar/index.php?action=authorize, appears to be non-functional at this time.
If you have reached this page from somewhere else...
This URI is part of the widar tool, maintained by Magnus Manske.
Perhaps its magical script elves are temporarily ill, or the link you've followed doesn't actually lead somewhere useful?
If you're pretty sure this shouldn't be an error, you may wish to notify the tool's maintainers (above) about the error and how you ended up here.
If you maintain this tool
The error might be caused by incorrect permission, or by an error in the script or CGI that was meant to execute here. You may wish to check your logs or common causes for errors in the help documentation.