Thank you for posting to the Telerik Developer Forums.
The reason for this error is that the plugin is not available in the AppBuilder clients (Web, Desktop, etc.) or Companion App and cannot be loaded in the simulator, there is not a problem in your project. Because the plugin is added to the app package in the Build
phase, it is not available in the project for testing in the simulator. Thus, even if the plugin is added to your project, you need to test the behavior on a real device and not in the simulator.
Also, according to the error, you are using Cordova 3.2 in your project. I'd suggest that you upgrade your project properties
to Cordova 3.5 (3.5.1) for Android. Note that this will automatically upgrade the integrated push plugin to the Telerik Push Notifications
Let me know if you have further questions.