title: Ionic 3 native email composer show error "plugin_not_installed"
body: <p>I am using <a href="https://ionicframework.com/docs/native/email-composer/" rel="nofollow noreferrer">this</a> in ionic 3 app. The plugin is installed. And <code>cordova-plugin-email-composer</code> folder is available in <code>plugins</code> folder. I have also uninstalled and reinstall it meany times. But it shows an error "plugin_not_installed".</p>
  
  <p><strong>config.xml</strong> </p>
  
  <pre><code>&lt;plugin name="cordova-plugin-email-composer" spec="^0.8.10" /&gt;
  </code></pre>
  
  <p><strong>TypeScript</strong></p>
  
  <pre><code>   this.emailComposer.isAvailable().then((available: boolean) =&gt;{
        if(available) {
          let email = {
              to: 'example@example.com',
              subject: "User Feedback",
              body: "",
              isHtml: true
            };
            this.emailComposer.open(email);
  
        }else{
          this.presentToast("Your mobile don't have any app for sending emails.")
        }
       }).catch(error=&gt;{
        this.presentToast(JSON.stringify(error));   //this show plugin_not_installed
       });
  </code></pre>