I am working with ArcMap Addins(Visual studio 2015 and ArcGIS 10.5.1 and OS Windows 7). code compiling time I got a error. same code I have used In Visual studio 2012 and Arc GIS 10.2 it is creation Addin with out any error.

I have changed my ESRI.ArcGIS.AddIns.targets file name to ESRI.ArcGIS.AddIns.11.targets. still my problem not solved.

Severity Code Description Project File Line Suppression State Error The "ValidateAddInXMLTask" task failed unexpectedly. System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.VisualStudio.Shell.12.0, Version=, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified. File name: 'Microsoft.VisualStudio.Shell.12.0, Version=, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' at ESRI.ArcGIS.AddIns.SDK.MSBuild.ValidateAddInXMLTask.Execute() at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute() at Microsoft.Build.BackEnd.TaskBuilder.d__26.MoveNext()

WRN: Assembly binding logging is turned OFF. To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1. Note: There is some performance penalty associated with assembly bind failure logging. To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog]. TaxParcel_Attribution_Update


I think you need to install the visual studio 2012 shell or copy its .dll into the GAC. How to compile an ArcGIS Desktop add-in in Visual Studio 2013

Second of all The integer 11 was added for Visual Studio 2012 and Visual Studio 2013, and removed at version 2015. http://support.esri.com/en/technical-article/000013261

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