Contract means that a person freely agrees to and accepts to enter into a contract, and unless such consent is granted freely and what is known as defect or office of consent which may render the contract subject to be annulled. The first vice of consent is error.
Mkataba ina maana kwamba mtu uhuru anakubaliana na na anapokea kuingia mkataba, na isipokuwa idhini hiyo imetolewa kwa uhuru na yale inajulikana kama kasoro au ofisi ya ridhaa ambayo inaweza kutoa mkataba chini ya patupu. makamu wa kwanza wa ridhaa ni kosa.