Report Viewer Error even after installing Report Viewer 2010 Distributable Package

Go to C:\WINDOWS\ASSEMBLY\GAC_MSIL On command line
Now use xcopy command to copy reportviewer dlls in bin folder of website build
e.g.

   " XCOPY /r Microsoft.ReportViewer.Common.dll
     TargetBinFolderPath"
   " XCOPY /r Microsoft.ReportViewer.WebForms.dll
     TargetBinFolderPath"
   " XCOPY /r Microsoft.ReportViewer.ProcessingObjectModel.dll
     TargetBinFolderPath"