Thanks for your reply!
Actually I didn’t find the reason why I got the error. But with new posts published and the post with problem disappeared in the feed, the error is gone~ I don’t know when I will have trouble again though…
Excellent! If you ever run into that problem again, use the validator from the link above, as it will probably tell you exactly what the problem is.
Oh I used exactly the link you provided to find my feed is not validated. But the problem is, I only know what part is wrong, but the error information is just something like “<unknown>:18:45: not well-formed (invalid token)”… So I really don’t know what was the problem
If I ever meet this error again, can I come back and ask you? I see you are spending a lot of time answering people’s questions here, I admire you!
When you see the error listed in the validator, click on it, and it will show you exactly where in your feed the problem is, usually an invalid character that you just need to re-type.
Alternatively, just let us know if you ever need any help. 🙂