Why are comments not working correctly in the Webasyst Blog Application?

Question

CMS

Good day to all!
Help me to understand.
Installed CMS Webasyst, it took to make two sections: blog and news. All this is easy and effortless. the design is screwed in the same way. In the blog and news, of course, the "Application Blog" is used (who knows, they will understand), there I decided not to go into the code of the standard design theme, I tried to leave all the scripts and styles connected, I just wrote my own below so that they would be in "priority ", visually everything is fine, I go to the news / blog section, there in a specific news / post, I try to leave a comment, everything works fine. But when I try to enter incorrect data (email, name, comment, captcha), the native Webasyst script should also work, highlight incorrectly filled fields with color and add text under the fields or next to them, but in the end I see a white page with text :

array ( 0 => array ( 'captcha' => 'Неверный код CAPTCHA', ), 1 => array ( 'text' => 'Текст комментария не может быть пустым', ), )

What could be the problem? Can anyone come across?
The comments.html code did not change, as well as default.blog.js, i.e. in fact, everything should work, but somewhere there is a conflict, and where I can not understand. Maybe my script files (I registered them right before the closing body) somehow interfere with the correct work?