This question already has an answer here:
After filling in the title and question fields, then three tags, I clicked on the submit button. Over and over I get the above message in a dark red box right next to the submit button. I can't see any errors on my part that is generating that error message.
Error generated in FF 19.0.2 and Chrome 25.0.1364.155.
I've submitted other questions earlier, so this is not a repeatable bug.