When there having been a meeting of the minds of the parties to a contract, their true intention is not expressed in the instrument purporting to embody the agreement, by mistake, fraud, inequitable conduct, or accident, one of the parties may ask for reformation to the end that such true intentions may be expressed.
If mistake, fraud, inequitable conduct, or accident, prevented the meeting of the minds of the parties, the remedy is not reformation of the instrument but annulment of the contract.