when trying to add an item to cart, I continuously get this error. I can go back and try again and it works, but I need to get this fixed. I tried to Google before posting but I don't understand enough to fix it.  "Parameter Missing or Invalid: Requi...

I don't think that will work because you can still browse the shop by all of my other collections. 

Currently, I am hiding out of stock items once they're sold out by removing them from the shop (removing from store sales channel), but then if someone does a search on the website, they can't find it either (specifically on the website homepage, not...