Crystal Report Export and Print Function Does not work in

Question

I have Visual Studio 2010 and I have installed Crystal Report all is going fine , I have a master page and my crystal report is in master page so it gets Css from master page as crystal report render as table , so i place a page which is not inherited from master page to ifram so my css issue resolved , Now my Print and export functionality is not working it gives that error 

" Method not found: 'CrystalDecisions.ReportAppServer.DataDefModel.PropertyBag CrystalDecisions.ReportAppServer.ReportDefModel.ISCRExportOptions.get_ExportOptionsEx()'." I hAVE INCLUDED BOTH THE IMPORTS 

Imports CrystalDecisions.CrystalReports.Engine

Imports CrystalDecisions.Shared

i DO NOT KNOW WHAT IS HAPPENING