Hi Sandeep Pulkundwar,
Thank you for writing.
The exception is related to the wrong reference to Telerik assemblies. After upgrading to a newer version you have to change all references in your projects everywhere you have used telerik controls. Please, check and replace your references in your class library, and all projects that contains telerik controls.
Do not hesitate to contact me again if you have other questions.
Best wishes,
Martin Vasilev
the Telerik team