An error occurred while searching; please try again
The error occurs when I try to enter a URL into the search box, or when I just click on a question to select it. The "Vote to Close" box remains greyed out and I can't can't submit.
It looks like this is a bug of some sort. I've never had this happen to me before. A similar problem happened on the main meta site in 2013 but it says it was fixed by a release: Unable to close as duplicate on Meta
I've tried in both Firefox and Chrome and I get the same error. I've tried again several times over about 15 minutes but the problem hasn't gone away.
Here is a screenshot: