Data Flow Task is no longer available in Visual Studio 2012 Project - visual-studio-2012

I've worked on an SSIS project in Visual Studio 2012 for a while. Recently, when I tried to modify it, the following error message shown on a "Data Flow Task":
"The task has failed to load". And I cannot find "Data Flow Task" item in SSIS Toolbox. When I tried to add a Data Flow Task on the canvas, got the error message below:
Registration information about the Data Flow task could not be
retrieved. Confirm that this task is installed properly on the
computer. ADDITIONAL INFORMATION: TaskHost
"{5918251B-2970-45A4-AB5F-01C3C588FE5A}"' is not installed correctly
on this computer. (Microsoft.DataTransformationServices.Design)
Any help and suggestion will be appreciated very much!
Server: Windows Server 2008 R2 Enterprise;
SQL Server: SQL Server 2012;
SQL Server Data Tools: 11.1.20627.00
Visual Studio Ultimate 2012

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IMG: http://i.stack.imgur.com/xpgNL.png
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http://go.microsoft.com/fwlink/?LinkID=274984
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Just in case the downloaded SQL Server Data Tools is not working. You can try to download this version:
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I faced a similar issue but in my case its due to version difference.Refer attached image. so once upgrade with right version then prob solved to me. enter image description here

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