Contract Annulment for Error and Fraudulent Concealment in Land Sale

A dispute arose concerning the validity of a contract for the sale of land, where the seller allegedly failed to disclose material facts regarding the property's legal status, leading the purchaser to seek annulment based on error and fraudulent concealment. The court overturned the lower court's decision, reasoning that a contract can be annulled for error when one party's consent was based on a mistaken belief regarding a quality of the thing sold that was essential to the contract, and that the seller's deliberate omission of known, decisive facts constituted deceit, justifying the contract's invalidation.