AJAX error

hello.
The form works, but there is an error if enabled “Submit via AJAX (without page reload)?”

{"form_id":2,"errors":false,"success":{"success_msg":"\u003Cp\u003E\u0412\u0430\u0448\u0435 \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u0435 \u0443\u0441\u043f\u0435\u0448\u043d\u043e \u043e\u0442\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u043e\u003C\/p\u003E\n"},"fields":{"6":"\u041a\u0443\u0446","8":"4444444"},"form_settings"

https://www.ads-software.com/plugins/ninja-forms/