How to solve "Some items are no longer available. Your cart has been updated"?

On the cart page, you may see the message  "Some items are no longer available. Your cart has been updated". Shopify blocks the customer from inputting the address. 

It means that the location doesn't have a correct shipping profile. You should visit BYOB => Setting to check the current location to store the dummy variants. After that, you can set a profile for the location or switch to another one. 

By default, our app uses the first active location fulfilled by you.