I'll assume WikiWho fixed it, then. Please re-open if anyone is still having problems.

The same error is back again (as reported in various discussions in the German Wikipedia).

We recently moved the WikiWho installation in-house (T288840) and are still ironing out some final issues. This appears to be one of them.

There were actually two problems:

• The workers that process incoming changes to Wikipedia went down for some time a few days ago. We got the workers running again, but they unfortunately don't backfill any changes that were missed. Instead, these are loaded on demand. So for some articles you may see an error, but try again in ~10 minutes and it should work and continue to work from then on.
• We had some per-IP throttling set on the API that was getting applied to XTools. This doesn't work for us because our IP is static so we can easily exceed the throttling limits. I have fixed this by setting the throttling amount to something really high, effectively disabling it entirely.

Both problems should be fixed now. @Tkarcher Thanks for flagging this issue! If you see this error again, try reloading after 10 minutes. If you still see the error, please let us know by re-opening this task. Thanks!

Hello,

the error is appearing again.

https://xtools.wmflabs.org/articleinfo-authorship/de.wikipedia.org/Disco_Elysium?uselang=en

Error querying Wikiwho API: Unknown

https://xtools.wmflabs.org/articleinfo-authorship/de.wikipedia.org/Disco_Elysium?uselang=de

Fehler beim Abruf der Wikiwho API: Unbekannt

Thanks a lot!

Thanks a lot, it is working again.