Joomla k2 error when adding a comment

Question

Joomla

white screen and line crashes

{"message":"\u0412\u044b \u0434\u043e\u043b\u0436\u043d\u044b \u0437\u0430\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u0432\u0441\u0435 \u043e\u0431\u044f\u0437\u0430\u0442\u0435\u043b\u044c\u043d\u044b\u0435 \u043f\u043e\u043b\u044f!"}

this is definitely related to the encoding, but I don’t understand at what point this problem is.
Joomla 2.5.16
k2 2.6.7
Google gave only here
joomlaforum.ru/index.php/topic,272584.new.html
and that's it. the Americans do not have this, because. everything is in English, and they have not seen such hieroglyphs.

Answer 1

this message says "You must fill in all required fields!"
what didn't you fill out? look for