Hey @katmacau,
Thanks for reaching out!
We tried to replicate this issue locally by:
1. Creating a Simple Product with a Purchase Dependency type and a ‘Hoodies’ category dependency: https://cl.ly/02d608f24854.
2. Adding a product from the ‘Hoodies’ category in the cart.
3. Adding the Simple Product we previously created to the cart.
4. Removing the product from the ‘Hoodies’ category from the cart — once we did that, then this notice showed up: https://cl.ly/58d720760e2a.
Is this not what you see?
If not, then there is a chance that this notice does not show up because of a conflict with your active theme or some other plugin.
Here’s how we usually address this type of issue:
1. Temporarily switch back to a default WordPress theme (or Storefront). If this resolves the issue, then please bring this to the attention of your theme author.
2. If the issue persists, then disable all other plugins except for WooCommerce and WooCommerce Product Dependencies. If this fixes the issue, then slowly re-enable plugins until you find the one that triggers it.
To avoid causing any problems to your live site, the best way to do this would be to try setting up a staging site, for example using a plugin such as WP Staging or Duplicator — and then troubleshoot the issue on the staging site.
Note that some hosts provide a Control Panel option for creating development/staging sites easily — if you are not sure about this, it might be worth asking your host as this is definitely the easiest and fastest way to do it.
Let us know what you find out!
Cheers,
Jason Kytros
Support Engineer
SomewhereWarm SMPC
https://somewherewarm.gr/