Cannot find the interop type that matches the embedded interop type 'Microsoft.VisualStudio.Shell.Interop.IVsWindowSearch'. Are you missing an assembly reference?

Hi,

 Am getting this "Cannot find the interop type that matches the embedded interop type 'Microsoft.VisualStudio.Shell.Interop.IVsWindowSearch'. Are you missing an assembly reference?" error in VS2013 when i tried to migrate the visual studio package project from vs2012 to vs2013.