Is it permissible for the buyer who benefited from an error in the land plot number to demand money in exchange for canceling the contract he concluded?

The buyer is not permitted to demand money from the seller in exchange for correcting an error in the item's number. This falls under the category of devouring people's wealth unlawfully. The buyer must respond to the seller's request to correct the error, and the cost of this correction is to be borne by the seller because he is the one who made the mistake.