success-function returns nothing

[infoforum]

Hello. Sorry for my English )
I added the plugin BarcodeScanner in my Phonegap-application.

1. Added to config.xml:
   <plugin name="com.phonegap.plugins.barcodescanner" spec="2.0.0" source="pgb" />
   and
   <preference name="android-build-tool" value="gradle" />
2. In the javascript:

cordova.plugins.barcodeScanner.scan(
      function (result) {
          alert("We got a barcode\n" +
                "Result: " + result.text + "\n" +
                "Format: " + result.format + "\n" +
                "Cancelled: " + result.cancelled);
      }, 
      function (error) {
          alert("Scanning failed: " + error);
      }
   );

3. The finished application I created through the site build.phonegap.com

Should I do anything else?
The scanner is triggered and even scans, that's just not give any value.
When I press the Cancel button on the scanner, the application falls (closed).
System log on the iPhone 5 contains the following entries after the scan:

Oct 11 20:18:49 iPhone MyApp[4669] <Warning>: WARNING: -[<AVCaptureVideoPreviewLayer: 0x15de5610> isOrientationSupported] is deprecated.  Please use AVCaptureConnection's -isVideoOrientationSupported
Oct 11 20:18:49 iPhone MyApp[4669] <Warning>: WARNING: -[<AVCaptureVideoPreviewLayer: 0x15de5610> setOrientation:] is deprecated.  Please use AVCaptureConnection's -setVideoOrientation:
Oct 11 20:18:49 iPhone MyApp[4669] <Warning>: WARNING: -[<AVCaptureVideoPreviewLayer: 0x15de5610> setOrientation:] is deprecated.  Please use AVCaptureConnection's -setVideoOrientation:
Oct 11 20:18:58 iPhone kernel[0] <Notice>: AppleH4CamIn::ISP_FlushInactiveDARTMappings: 0x00000000
Oct 11 20:18:58 iPhone MyApp[4669] <Error>: -[CDVPluginResult toSuccessCallbackString:]: unrecognized selector sent to instance 0x15d28ad0

Please tell me what is wrong?

Do I have to include the file: <script type = "text/javascript" src = "barcodescanner.js"></ script> in my index.html?