It flashes pretty quickly, so it’d be hard to screenshot. It just says the item can’t be moved. I’m guessing the fundamental issue is you can’t move blood within the inventory space for the workstation (sacrificial stone) and when it creates the vial from the blood, it thinks the blood is being “moved”.

Like I said, this is purely cosmetic (the blood vials are created), but it looks weird that everytime you craft a vial you get this spurious error message.