How to use the sweetalert2.showValidationMessage function in sweetalert2

.catch(error => {
              swal.showValidationMessage(
                `Request failed: ${error}`
              )
            })
        },

}).then(() => true).catch(err => {
                    Swal.showValidationMessage(err);
                });
            }

preConfirm: amount => {
                if(isNaN(amount) || amount <= 0) {
                    Swal.showValidationMessage('Invalid tip amount provided');
                    return false;
                }

                return Utils.contract.tipMessage(+messageID).send({
                    callValue: Number(amount) * 1000000
                }).then(() => true).catch(err => {
                    Swal.showValidationMessage(err);
                });
            }
        });