Karma-Selector [ng\:model="userName"] did not match any elem

// contents of index.html
!DOCTYPE html>
<html ng-app="E2ETesting">
<head>
    <title>Angularjs Karma Testing</title>
    <script type="text/javascript" src="js/angular.js-1.1.1/angular.min.js"></script>
    <!-- <script type="text/javascript" src="test/e2eindexspec.js"></script> -->
    <script type="text/javascript" src="http://code.angularjs.org/1.0.6/angular-scenario.js" ng-autotest></script>

</head>
<body>
<label>User Name:</label>
<input type="text" ng-model="userName" placeholder="Enter Your User Name" />
</body>
</html>


// contents of Karma.conf.js
module.exports = function(config) {
config.set({
frameworks: ['ng-scenario'],

files: [
'e2eSpec.js'
],

urlRoot: '/__karma/',

autoWatch: true,

proxies: {
'/': 'http://localhost:8000/'
},

browsers: [process.env.TRAVIS ? 'Firefox' : 'Chrome'],

reporters: ['dots'],

plugins: [
'karma-ng-scenario',
'karma-chrome-launcher',
'karma-firefox-launcher'
]
});
};
//e2espec.js
describe ("E2ETesting" , function() {

    it("should check username ", function() {

    browser().navigateTo('index.html');

    input('userName').enter('ss');
    expect(element('.ng-binding').text()).toEqual('ss');
    //expect(element('.ng-binding').text()).toEqual('Sanp');
});


});
// The error message

describe: E2ETesting
205ms should check username
123ms   browser navigate to 'index.html'
17ms    input 'userName' enter 'ss'
http://localhost:9876/base/e2eSpec.js:7:2

Selector [ng\:model="userName"] did not match any elements.