Elementor plugin not working with new WordPress theme?

Question

WordPress

Good afternoon!
I ran into such a problem, I created a theme on Wordpress through the underscores service, set it up, everything works, I install the Elementor plugin, the plugin does not work, it gives an error when saving. I return to the old Wordpress theme, the plugin works fine. I don't understand much what is the problem and how can I solve it?
Maybe someone faced this problem?

Answer 1

Here you need to debug.