System.NotSupportedException: Unable to activate instance of type... Xamarin EMDK SampleProject

J Jeremy Henkes,2oh928vwkwbk952gi2osgjlwg0p7eukk 2 years 11 months ago
70 2 0

Hi everyone,
 
I am currently trying to get the BasicScanningTutorial running on a TC55 device with Xamarin in Visual Studio. I downloaded the sample from HERE. I can debug the application and everything works as expected, but whenever I minimize the app (pressing Android 'Back' or 'Home' button), following error comes up:
 
01-10 00:22:51.074 I/MonoDroid(13455): UNHANDLED EXCEPTION:
01-10 00:22:51.084 D/dd:     (13455): scanner.release: isBTScanner: false
01-10 00:22:51.094 I/MonoDroid(13455): System.NotSupportedException: Unable to activate instance of type Symbol.XamarinEMDK.Barcode.Scanner+IStatusListenerImplementor from native handle 1d200001 ---> System.MissingMethodException: No constructor found for Symbol.XamarinEMDK.Barcode.Scanner+IStatusListenerImplementor::.ctor(System.IntPtr, Android.Runtime.JniHandleOwnership) ---> Java.Interop.JavaLocationException: Exception of type 'Java.Interop.JavaLocationException' was thrown.
01-10 00:22:51.094 I/MonoDroid(13455): Java.Lang.Error: Exception of type 'Java.Lang.Error' was thrown.
01-10 00:22:51.094 I/MonoDroid(13455):   --- End of managed exception stack trace ---
 
It doesn't always happen after the first time, but it is guaranteed to happen after reopening and minimizing it a couple of times. It also sometimes happens that there is no error, but then the scanner won't read barcodes anymore. The scanner is enabled and the laser is showing on hard-button press, but nothing happens when trying to scan a barcode.
I don't really know how to resolve this issue. I followed the instructions on how to set everything up (VS, Xamarin, EMDK), thus everything should be set up correctly. I didn't change any of the sample code from BasicScanningTutorial.
 
So why exactly do I get the exception mentioned above and what can I do to resolve this issue?
 
I appreciate any help!
 
Regards,Jeremy

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2 Replies

u umit Bostanci

Hi,

any update on this issue? I am trying with 2.3 version and having same error

thanks

V Vedsatx Saddvv

Hello Jeremy, Sorry for the delay, I will need to try to duplicate the issue, and possibly get some help from engineering to drive this issue to a resolution.  To aid in that process, could you provide the which the build number of the OS running on your TC55?  Found in  Settings > About Phone.

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