This question already has an answer here:
I recently wanted to post an answer to this question:
However, at the bottom of the page, I saw the following notice:
Thank you for your interest in this question. Because it has attracted low-quality answers, posting an answer now requires 10 reputation on this site.
As far as I can tell, I have 60 reputation, unless I'm misunderstanding what reputation means in this context (I clicked on the link to reputation and as far as I can tell I'm not).
Note that the "duplicate" post shows a different message. In that message, the intent is clear (you must have earned reputation). I got a different, erroneous message.
UPDATE: posted on Meta SE: Incorrect wording in protected question status