I got ReferenceError: Firebase is not defined during push the data into Firebase DB in AngularJS? -


how fix error ?

//here our controller code  var app = angular.module("myapp", ["firebase"]);  	app.controller("myctrl", function($scope, $firebase, $firebaseobject) {    	$scope.submitdata = function() {  		var name = $scope.user;  		var pass = $scope.password;  		var firebaseobj = new firebase("https://angulardemo-72e92.firebaseio.com/");              var fb = $firebase(firebaseobj);            fb.$push({ name: name,password: pass}).then(function(ref) {              console.log(ref);          }, function(error) {              console.log("error:", error);          });  	}	    });
<html>  <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.4/angular.min.js"></script>    <script src="firebase.js"></script>    <script src="angularfire.min.js"></script>    <script src="app.js"></script>    <script>  	  // initialize firebase  	  var config = {  	    apikey: "aizasybqksccuxgkotmwbdspubfqvic-xt9p5dy",  	    authdomain: "angulardemo-72e92.firebaseapp.com",  	    databaseurl: "https://angulardemo-72e92.firebaseio.com",  	    projectid: "angulardemo-72e92",  	    storagebucket: "angulardemo-72e92.appspot.com",  	    messagingsenderid: "230268694130"  	  };    	firebase.initializeapp(config);  </script>  	<body>  		<div ng-app="myapp" ng-controller="myctrl">  			enter name<input type="text" ng-model="user"><br>  			enter passwrod <input type="text" ng-model="password">  			<button type="sumbit" name="sumbit" value="sumbit" ng-click="submitdata()">login</button>   		</div>  	</body>  </html>

hello sir, have push data firebase db got error firebase undefined, in angularjs please tell me whats wrong in code ?


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