Bug 26204 - [Migration Tool] Migrating to Unified fails with a generic Object Reference error dialog
Summary: [Migration Tool] Migrating to Unified fails with a generic Object Reference e...
Alias: None
Product: Visual Studio Extensions
Classification: Xamarin
Component: General ()
Version: 3.9
Hardware: PC Mac OS
: Normal normal
Target Milestone: ---
Assignee: Bugzilla
Depends on:
Reported: 2015-01-20 12:23 UTC by John Miller [MSFT]
Modified: 2016-12-22 21:40 UTC (History)
6 users (show)

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

Logs (73.25 KB, application/octet-stream)
2015-01-20 12:23 UTC, John Miller [MSFT]

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Description John Miller [MSFT] 2015-01-20 12:23:38 UTC
Created attachment 9417 [details]


   When migrating a project to the unified API, a dialog box pops up with "Object Reference not set to the Instance of an Object". 

**Steps to Reproduce:**


**Actual Results:**

   Dialog box pops up with a NRE message in it. 

**Expected Results:**

   No errors. 

**Build Date & Platform:**

   XVS 3.9

**Additional Information:**

   Attached are the logs from a migration that failed with this message. In the logs is this message:

>Xamarin.VisualStudio.Shell.XamarinShellPackage Error: 0 : [2015-01-20 08:42:46.1] Background task error
>System.NullReferenceException: Object reference not set to an instance of an object.
>   at Xamarin.InsightsCore.PlatformServices.<>c__DisplayClass4.<GetDeviceInfoData>b__3()
>   at System.Threading.Tasks.Task`1.InnerInvoke()
>   at System.Threading.Tasks.Task.Execute()
Comment 1 Sunil Kumar 2015-01-20 14:09:30 UTC
We have tried to reproduce this issue several times but not able to reproduce. We are not getting any dialog box popup when migrating Classic API project to Unified API and project migrated successfully. May the developer will get some useful information from attached logs. leaving as New for now.

Screencast: http://www.screencast.com/t/JWg6r8o2JEO7

Environment info:
VS 2013 Update 4
XVS 3.9.236 and XVS 3.9.278
Comment 2 Eugene Berdnikov 2015-02-04 08:42:36 UTC
I've reproduced the issue on our project. Than I've attached the VS debugger to the VS instance with the project and could localize the part of the code, which causes the exception.
In my case, the exception is thrown while processing of a statement containing a class with fully qualified name (including a namespace), like System.DateTime.Now. After removing of the namespace (import it with using directive), the migration is successful for that file.

So, here are the steps to reproduce:
  1. Create an iPhone Classic project.
  2. Write in any method the next line:
     var d = System.DateTime.Now;
  3. Try to migrate the project to Xamarin.iOS Unified API.
The migration will be interrupted on the changed file with message "Object Reference not set to the Instance of an Object".

I hope this helps you to fix the exception. Until that I need to correct the code to get rid of the error.
Comment 3 Saurabh 2015-02-17 08:46:30 UTC
I have followed steps mentioned in Comment#2, I am also not able to reproduce this Issue. This is the screencast for the same: http://www.screencast.com/t/UAUxAPTr

Microsoft Visual Studio Professional 2013
Version 12.0.31101.00 Update 4
Microsoft .NET Framework
Version 4.5.51641

Installed Version: Professional

LightSwitch for Visual Studio 2013   06177-004-0446016-02238
Microsoft LightSwitch for Visual Studio 2013

Team Explorer for Visual Studio 2013   06177-004-0446016-02238
Microsoft Team Explorer for Visual Studio 2013

Visual Basic 2013   06177-004-0446016-02238
Microsoft Visual Basic 2013

Visual C# 2013   06177-004-0446016-02238
Microsoft Visual C# 2013

Visual C++ 2013   06177-004-0446016-02238
Microsoft Visual C++ 2013

Visual F# 2013   06177-004-0446016-02238
Microsoft Visual F# 2013

Visual Studio 2013 Code Analysis Spell Checker   06177-004-0446016-02238
Microsoft® Visual Studio® 2013 Code Analysis Spell Checker

Portions of International CorrectSpell™ spelling correction system © 1993 by Lernout & Hauspie Speech Products N.V. All rights reserved.

The American Heritage® Dictionary of the English Language, Third Edition Copyright © 1992 Houghton Mifflin Company. Electronic version licensed from Lernout & Hauspie Speech Products N.V. All rights reserved.

Windows Phone SDK 8.0 - ENU   06177-004-0446016-02238
Windows Phone SDK 8.0 - ENU

Application Insights Tools for Visual Studio Package   1.0
Application Insights Tools for Visual Studio

ASP.NET and Web Tools   12.4.51016.0
Microsoft Web Developer Tools contains the following components:
Support for creating and opening ASP.NET web projects
Browser Link: A communication channel between Visual Studio and browsers
Editor extensions for HTML, CSS, and JavaScript
Page Inspector: Inspection tool for ASP.NET web projects
Scaffolding: A framework for building and running code generators
Server Explorer extensions for Microsoft Azure Websites
Web publishing: Extensions for publishing ASP.NET web projects to hosting providers, on-premises servers, or Microsoft Azure

ASP.NET Web Frameworks and Tools 2012.2   4.1.21001.0
For additional information, visit http://go.microsoft.com/fwlink/?LinkID=309563

ASP.NET Web Frameworks and Tools 2013   5.2.21010.0
For additional information, visit http://www.asp.net/

Common Azure Tools   1.3
Provides common services for use by Azure Mobile Services and Microsoft Azure Tools.

Microsoft Azure Mobile Services Tools   1.3
Microsoft Azure Mobile Services Tools

NuGet Package Manager   2.8.50926.663
NuGet Package Manager in Visual Studio. For more information about NuGet, visit http://docs.nuget.org/.

Office Developer Tools for Visual Studio 2013 ENU   12.0.30626
Microsoft Office Developer Tools for Visual Studio 2013 ENU

PowerShell Tools   1.3
Provides file classification services using PowerShell

PreEmptive Analytics Visualizer   1.2
Microsoft Visual Studio extension to visualize aggregated summaries from the PreEmptive Analytics product.

SQL Server Data Tools   12.0.41012.0
Microsoft SQL Server Data Tools

Windows Phone 8.1 SDK Integration   1.0
This package integrates the tools for the Windows Phone 8.1 SDK into the menus and controls of Visual Studio.

Workflow Manager Tools 1.0   1.0
This package contains the necessary Visual Studio integration components for Workflow Manager.

Xamarin   3.9.325.0 (96e7814)
Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android.

Xamarin.Android (49a04b966feb40dfdba49d57ba16249b66d606a6)
Visual Studio plugin to enable development for Xamarin.Android.

Xamarin.iOS (09ae75f83eafce1bdc3fa067f281cbdf1ca7b893)
Visual Studio extension to enable development for Xamarin.iOS.

Xamarin.iOS Unified Migration   1.0
Automated migration for Xamarin iOS Classic projects to Unified.

@Eugene, Could you please provide me test project and build info?
Comment 4 Eugene Berdnikov 2015-02-18 08:42:08 UTC
It seems it has been fixed with XVS 3.9.289, because I couldn't reproduce it after update. But I've checked again, it is still reproducing on XVS 3.9.236.

Thank you!
Comment 5 Jose Gallardo 2016-12-22 21:40:47 UTC
As per Comment 4 resolving this report as Fixed.