I get this JS error when posting a comment

[ajn123]

It seems to be happening here:

I don't know how to really tackle this one.

[the-teacher]

Hey! Hello! .errors is the field in your AJAX response.
Please open Network tab, find a request to a server and make a screenshot of AJAX response.
Maybe you just have a server side error.

[ajn123]

I had to delete the ralis 5 rails-ujs