I would normally use the definite article in both places.
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GPYI would normally use the definite article in both places.Thank you. May I ask, GPY, if it is an error not to?
tomasdThank you. May I ask, GPY, if it is an error not to?No, it is not actually an error.
tomasdThank you. May I ask, GPY, if it is an error not to?It is not an error. The definite article is just more natural/better. You expect there to be dust on the walls and rust on the faucets in one's house.