Push notification in Ionic 1 using FCM

ionic-v1
1

How can i do that push notification in this
I follow this process

  1. Create the Project
  2. Add the ionic cordova plugin add cordova-plugin-fcm
    and Follow those instruction
    https://www.ttmind.com/TechPost/Firebase-Cloud-Messaging-FCM-using-Cordova-FCM-Plugin
  3. Add android Platform and run in browser and Android Device but is giving me the Error

caught ReferenceError: FCMPlugin is not defined
** ** app.js:11
** ** Array. (ionic.bundle.js:56238)**
** ** onPlatformReady (ionic.bundle.js:2496)**
** ** onWindowLoad (ionic.bundle.js:2477)**

And in app.js used this code
FCMPlugin.onTokenRefresh(function(token){
alert( token );
var div = document.getElementById(‘divToken’);
div.innerHTML += token;
});

	FCMPlugin.onNotification(
        function(data){
			if(data.wasTapped){
				//Notification was received on device tray and tapped by the user.
				alert( JSON.stringify(data) );
			}else{
				//Notification was received in foreground. Maybe the user needs to be notified.
				alert( JSON.stringify(data) );
			}
        },
        function(msg){
			console.log('onNotification callback successfully registered: ' + msg);
        },
        function(err){
			console.log('Error registering onNotification callback: ' + err);
        }
	);

But show me this error