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Error in a VS 2012 project

Question asked by shaningesri on Sep 12, 2016
Latest reply on Sep 12, 2016 by shaningesri

I installed VS 2012 Ultimate and also ArcObjects WDK for MS .Net FW.  Then I opened a .sln on the VS 2012 but got the Error below:

The "ValidateAddInXMLTask" task could not be loaded from the assembly ESRI.ArcGIS.AddIns.SDK, Version=, Culture=neutral, PublicKeyToken=8fc3cc631e44ad86. Could not load file or assembly 'Microsoft.VisualStudio.Shell.9.0, Version=, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified. Confirm that the <UsingTask> declaration is correct, that the assembly and all its dependencies are available, and that the task contains a public class that implements Microsoft.Build.Framework.ITask.

I checked the Registry Editor, and did see the item: ESRI.ArcGIS.AddIns.SDK.11, Version=""

What should I do to debug it?  Appreciate if you can help for this issue.