This is the error I receive when trying to "Add links" to a page through Wikibase in MediaWiki 1.35.
Is there any way to improve the error message we receive, to help with troubleshooting?
Topic on Talk:Wikibase
I'm afraid this needs much more context. Is this on wikidata.org or your own wiki? Do you see anything in the JavaScript console?
Hello, Thiemo.
It's in a wiki I am helping run.
I checked the console and found these errors, which may help find out what causes it:
"Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource" https://shared.prolewiki.org/api.php?action=query&format=json&origin=https%3A%2F%2Fen.prolewiki.org&meta=userinfo(Reason: CORS header ‘Access-Control-Allow-Origin’ missing).
If we try to access that link, we get
"'origin' parameter does not match Origin header"
I'm afraid I can't help with that. I suggest to check if Manual:CORS is helpful.
I'd bet this has nothing to do with Wikidata. Have you gone through the sitelinks documentation here? Wikibase/Installation#Enable Sitelinks