Bug 28310 - Error on starting Xamarin Android Player
Summary: Error on starting Xamarin Android Player
Status: RESOLVED FIXED
Alias: None
Product: Xamarin Android Player
Classification: Xamarin
Component: Player ()
Version: unspecified
Hardware: PC Windows
: --- normal
Target Milestone: ---
Assignee: Bugzilla
URL:
Depends on:
Blocks:
 
Reported: 2015-03-22 18:02 UTC by Lubomir Sokolovsky
Modified: 2015-05-13 09:35 UTC (History)
3 users (show)

Tags:
Is this bug a regression?: ---
Last known good build:

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Status:
RESOLVED FIXED

Description Lubomir Sokolovsky 2015-03-22 18:02:36 UTC
I was using Xamarin Android Player without any problems. Yesterday (21st March 2015) I downloaded the newest Android SDK and Xamarin Android packages. I noticed the new "Manage virtual devices (XAP)" button, but it remained unavailable even when I launched a XAP device. So I tried to Open Android Device Monitor (DDMS), but at that point my Visual Studio froze. I stopped the XAP device and had to kill Visual Studio. When trying to launch XAP again, the Android Device Monitor finally opened up with some prompt about sending usage information to Google. At the same time, I got the following error from the XAP:

System.NullReferenceException: Object reference not set to an instance of an object.
   at DeviceManager.SingleInstanceApplication.Activate()
   at DeviceManager.SingleInstanceManager.OnStartupNextInstance(StartupNextInstanceEventArgs e)
   at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnStartupNextInstanceMarshallingAdaptor(Object args)

And from that point I am unable to start the Xamarin Android Player (I always get the same error message).
Comment 1 Marcos Cobeña Morián 2015-03-26 06:39:14 UTC
I'm experiencing the same issue since this morning.

This' the full message I get:

"
See the end of this message for details on invoking 
just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************
System.NullReferenceException: Object reference not set to an instance of an object.
   at DeviceManager.SingleInstanceApplication.Activate()
   at DeviceManager.SingleInstanceManager.OnStartupNextInstance(StartupNextInstanceEventArgs e)
   at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnStartupNextInstanceMarshallingAdaptor(Object args)


************** Loaded Assemblies **************
mscorlib
    Assembly Version: 4.0.0.0
    Win32 Version: 4.0.30319.34014 built by: FX45W81RTMGDR
    CodeBase: file:///C:/Windows/Microsoft.NET/Framework/v4.0.30319/mscorlib.dll
----------------------------------------
DeviceManager
    Assembly Version: 0.2.5.0
    Win32 Version: 0.2.5
    CodeBase: file:///C:/Program%20Files/Xamarin%20Android%20Player/DeviceManager.exe
----------------------------------------
PresentationFramework
    Assembly Version: 4.0.0.0
    Win32 Version: 4.0.30319.34004
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/PresentationFramework/v4.0_4.0.0.0__31bf3856ad364e35/PresentationFramework.dll
----------------------------------------
WindowsBase
    Assembly Version: 4.0.0.0
    Win32 Version: 4.0.30319.34004 built by: FX45W81RTMGDR
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/WindowsBase/v4.0_4.0.0.0__31bf3856ad364e35/WindowsBase.dll
----------------------------------------
System
    Assembly Version: 4.0.0.0
    Win32 Version: 4.0.30319.34239 built by: FX452RTMGDR
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System/v4.0_4.0.0.0__b77a5c561934e089/System.dll
----------------------------------------
PresentationCore
    Assembly Version: 4.0.0.0
    Win32 Version: 4.0.30319.34004 built by: FX45W81RTMGDR
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_32/PresentationCore/v4.0_4.0.0.0__31bf3856ad364e35/PresentationCore.dll
----------------------------------------
System.Xaml
    Assembly Version: 4.0.0.0
    Win32 Version: 4.0.30319.33440 built by: FX45W81RTMREL
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Xaml/v4.0_4.0.0.0__b77a5c561934e089/System.Xaml.dll
----------------------------------------
Microsoft.VisualBasic
    Assembly Version: 10.0.0.0
    Win32 Version: 12.0.20806.33440 built by: FX45W81RTMREL
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/Microsoft.VisualBasic/v4.0_10.0.0.0__b03f5f7f11d50a3a/Microsoft.VisualBasic.dll
----------------------------------------
System.Core
    Assembly Version: 4.0.0.0
    Win32 Version: 4.0.30319.33440 built by: FX45W81RTMREL
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Core/v4.0_4.0.0.0__b77a5c561934e089/System.Core.dll
----------------------------------------
System.Windows.Forms
    Assembly Version: 4.0.0.0
    Win32 Version: 4.0.30319.33440 built by: FX45W81RTMREL
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Windows.Forms/v4.0_4.0.0.0__b77a5c561934e089/System.Windows.Forms.dll
----------------------------------------
System.Drawing
    Assembly Version: 4.0.0.0
    Win32 Version: 4.0.30319.33440 built by: FX45W81RTMREL
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Drawing/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll
----------------------------------------
System.Runtime.Remoting
    Assembly Version: 4.0.0.0
    Win32 Version: 4.0.30319.34243 built by: FX452RTMGDR
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Runtime.Remoting/v4.0_4.0.0.0__b77a5c561934e089/System.Runtime.Remoting.dll
----------------------------------------
System.Configuration
    Assembly Version: 4.0.0.0
    Win32 Version: 4.0.30319.33440 built by: FX45W81RTMREL
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Configuration/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll
----------------------------------------
System.Xml
    Assembly Version: 4.0.0.0
    Win32 Version: 4.0.30319.34230 built by: FX452RTMGDR
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Xml/v4.0_4.0.0.0__b77a5c561934e089/System.Xml.dll
----------------------------------------
PresentationFramework.Aero2
    Assembly Version: 4.0.0.0
    Win32 Version: 4.0.30319.33440 built by: FX45W81RTMREL
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/PresentationFramework.Aero2/v4.0_4.0.0.0__31bf3856ad364e35/PresentationFramework.Aero2.dll
----------------------------------------
PresentationFramework-SystemXml
    Assembly Version: 4.0.0.0
    Win32 Version: 4.0.30319.33440
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/PresentationFramework-SystemXml/v4.0_4.0.0.0__b77a5c561934e089/PresentationFramework-SystemXml.dll
----------------------------------------
UIAutomationTypes
    Assembly Version: 4.0.0.0
    Win32 Version: 4.0.30319.33440 built by: FX45W81RTMREL
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/UIAutomationTypes/v4.0_4.0.0.0__31bf3856ad364e35/UIAutomationTypes.dll
----------------------------------------
Newtonsoft.Json
    Assembly Version: 6.0.0.0
    Win32 Version: 6.0.4.17603
    CodeBase: file:///C:/Program%20Files/Xamarin%20Android%20Player/Newtonsoft.Json.DLL
----------------------------------------
System.Numerics
    Assembly Version: 4.0.0.0
    Win32 Version: 4.0.30319.33440 built by: FX45W81RTMREL
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Numerics/v4.0_4.0.0.0__b77a5c561934e089/System.Numerics.dll
----------------------------------------
System.ComponentModel.DataAnnotations
    Assembly Version: 4.0.0.0
    Win32 Version: 4.0.30319.33440
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.ComponentModel.DataAnnotations/v4.0_4.0.0.0__31bf3856ad364e35/System.ComponentModel.DataAnnotations.dll
----------------------------------------
System.Runtime.Serialization
    Assembly Version: 4.0.0.0
    Win32 Version: 4.0.30319.34230 built by: FX452RTMGDR
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Runtime.Serialization/v4.0_4.0.0.0__b77a5c561934e089/System.Runtime.Serialization.dll
----------------------------------------
System.Xml.Linq
    Assembly Version: 4.0.0.0
    Win32 Version: 4.0.30319.33440 built by: FX45W81RTMREL
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Xml.Linq/v4.0_4.0.0.0__b77a5c561934e089/System.Xml.Linq.dll
----------------------------------------
System.Data
    Assembly Version: 4.0.0.0
    Win32 Version: 4.0.30319.33440 built by: FX45W81RTMREL
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_32/System.Data/v4.0_4.0.0.0__b77a5c561934e089/System.Data.dll
----------------------------------------
PresentationFramework-SystemXmlLinq
    Assembly Version: 4.0.0.0
    Win32 Version: 4.0.30319.33440
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/PresentationFramework-SystemXmlLinq/v4.0_4.0.0.0__b77a5c561934e089/PresentationFramework-SystemXmlLinq.dll
----------------------------------------
System.IO.Compression.FileSystem
    Assembly Version: 4.0.0.0
    Win32 Version: 4.0.30319.33440
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.IO.Compression.FileSystem/v4.0_4.0.0.0__b77a5c561934e089/System.IO.Compression.FileSystem.dll
----------------------------------------
System.IO.Compression
    Assembly Version: 4.0.0.0
    Win32 Version: 4.0.30319.34003
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.IO.Compression/v4.0_4.0.0.0__b77a5c561934e089/System.IO.Compression.dll
----------------------------------------
UIAutomationProvider
    Assembly Version: 4.0.0.0
    Win32 Version: 4.0.30319.33440 built by: FX45W81RTMREL
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/UIAutomationProvider/v4.0_4.0.0.0__31bf3856ad364e35/UIAutomationProvider.dll
----------------------------------------

************** JIT Debugging **************
To enable just-in-time (JIT) debugging, the .config file for this
application or computer (machine.config) must have the
jitDebugging value set in the system.windows.forms section.
The application must also be compiled with debugging
enabled.

For example:

<configuration>
    <system.windows.forms jitDebugging="true" />
</configuration>

When JIT debugging is enabled, any unhandled exception
will be sent to the JIT debugger registered on the computer
rather than be handled by this dialog box.
"

I've tried what @Chrisvanwyk mentions at

http://forums.xamarin.com/discussion/comment/106132/#Comment_106132

but doesn't work, same behaviour.

I've also downloaded the latest installer from the web this same morning, uninstalled previously the one I had, but it keeps behaving in the same way.

I'm using

XAP-Beta-15.02-v0.2.5-amd64.exe
Comment 2 Will Schaller 2015-04-09 12:48:05 UTC
We are looking into this bug now, in the meantime if it happens you can get around it by opening the Task Manager and ending the process "DeviceManager.exe"
Comment 3 Will Schaller 2015-05-13 09:35:05 UTC
This is fixed in development branch, will be in the next update (0.4)