Looks like you’re using a theme that has been modified and it is looking for that specific snippet. If you’re modifying the code yourself, you should be able to find a snippet that says something like:
{% render 'quantity-breaks-now' %}
Easiest thing would be just to remove the section/block in question that’s causing the snippet to be called with missing information. This can happen for a variety of reasons but is usually because the code has been modified and needs to be fixed. If you purchased your theme from the theme store, you should reach out to that theme provider in order to get support. If you’ve customized the theme, they cannot help with that but if this is a fresh install they’ll help you resolve.