Contract Nullity Due to Fundamental Error Regarding Property Interest

A contract for the sale of land was deemed void due to a fundamental error regarding the nature of the property interest being transferred, as the seller believed they were selling full ownership but the buyer understood they were purchasing only usufruct rights. The Court of Cassation upheld the lower court's decision to annul the sale, reasoning that a mutual misunderstanding concerning an essential element of the contract—the very object of the agreement—constitutes a valid basis for nullity due to error, regardless of which party's fault it may be.