cordova-plugin-email-composer: Unable to open email client

Hello folks,

I had tried everything to use this cordova-plugin-email-composer in my cordova based phonegap application. when I am using below code that complains me through chrome browser inspect shows **“Cannot read property ‘email’ of undefined” ** , how ever I already used **“email_composer.js”**in my index.html file. Additionally, I already included <gap:plugin name=“cordova-plugin-email-composer” version=“0.8.3” source=“npm” /> in my config.xml too. can you please help why code is not working ?

In my device ready function and button click event :

cordova.plugins.email.open({
            to: '',
            subject: 'test subject',
            body:'',
            isHTML: false
        });

my index.html code :

<script type="text/javascript" src="js/jspdf.min.js"></script>
<script type="text/javascript" src="js/email_composer.js"></script>