I’m getting these WooCommerce errors even though I didn’t change them, and when I look in the control panel, from what I can see they’re not the same anyway. Anyone know how I can fix this?

This error is showing up when I view my cart after adding something to it. I’m just doing a test run of WooCommerce checkout process.

Am I wrong, or is this plugin not great? First there is no easy way I can see to just add a product to any page you like. And secondly, this happens.