Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
It says "your answer couldn't be...".
I tried posting a question on meta and not an answer. A bug perhaps?
This will be fixed in the next build (rev 2015.2.20.2330).
You are right that the message is wrong. It should say "question" instead of "answer". You should put this bug report up on Meta.SE.
As for the warning itself, meta questions must have one of the tags discussion, bug, feature-request, support, so it's by design.