Error can not add the product in basket

Hello

I would like to start by praising your plugin, super well designed, but have some small problems, every time I try to add the product to the cart, I get an error that says K99 its the product is not bundled of pakke, you can not add this bundled in the cart.

Why?

Link: https://dreamwall.dk/vare/pakke

With best regards
Thomas