Alert.alert not working in React native iOS, but perfectly fine in Android

Please check the code ,

import { 
  Alert,
} from 'react-native';




Alert.alert('Login Failed',
            'Multiple Logins Are Found. \n Logout From All Other Devices to Continue.',
             [
               {
                  text: 'Proceed ?',
                  onPress: () => {

                },
                {
                  text: 'No',
                  onPress: () => {},
                },
              ],
              {cancelable: false},
          );

This snippet will work fine in android but not showing in iOS. why ?