Parameter Missing Or Invalid: Required Parameter Missing Or Invalid: Items

Hi all

I recently start to get this error (See below) when hitting the “add to cart” button, not on all items but recently this start to come up more often,

I see many discussions about this error where a lot of people have the same issue but I am not a website developer and I don’t have any experience with coding so is there anything I can do my self to fix this problem?

Please help!