ionic 2 problem .please help

[mrosama]

scan camera is open but not get any value in console .also not enter inside CardIO.scan function
my code :
import { CardIO } from 'ionic-native';

scancard():any{
CardIO.canScan().then((res: boolean) => {
console.log('begin');
if (res) {

let options = {
requireCardholderName: true,
requireExpiry: true,
requireCCV: true,
requirePostalCode: true,
scanInstructions: "Scan your card",
scanExpiry: true,
scanCardHolderName: true,
keepApplicationTheme:true,
guideColor: '#12be76',
hideCardIOLogo: true,
useCardIOLogo:false,
};

CardIO.scan(options).then((data) => {
console.log("begin Scan");
console.log(data);
alert(data);

}, err => {
console.log("Error message :" + err);
// An error occurred
});
}

  });

}
///any help