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 => Fulfillment 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.