Well, without knowing what printer it is or the full text of the error message, or what lead up to your proboem, this is a guess.
Wrong ink cart.
Empty ink cart
Missing ink cart.
Mis-installed ink cart.
Many ink carts have a piece of tape over the contacts or over an air breather hole. This must be removed before installing it.
Some printers have delicate contacts that can be bent or broken if the cart isn't installed carefully.
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