appears apply beta cart changed code codes combination dialog discount error exist information item items message number persisted product removed sale shopping site states suspected user variants version whenever

I have three items for sale on the Beta version of my site. Recently, I have noticed an error message whenever a user tries to two of these three items to the shopping cart. A dialog box appears which states "This product combination does not exist".

I suspected that this error message had something to do with the discount codes that I tried to apply to 2 of my 3 items. However, when I removed the discount code information the error message persisted.

That means that the items was either removed or the item number or variants was changed and you are still using the old code.