Problem 5886 with a non-generic product

Hello,

Trying to add a product on my inventory I get the error 5886 ( You cannot change a product detail page, or add offers on another seller’s generic product, or copy the product detail page to another store. If you want to sell a generic product, you must create a new product. ), but it is NOT a generic product, it's from Airthings (ASIN: B0CPZ3M9VN), have you had that same problem before? How could I solve it? I guess I should create a new listing but I would like to ask for advice before.