Crystal Report Viewer not working on Widnows Server 2008

The following code when running on my local windows 7 machine works fine
  CrystalReportViewer1.ReportSource = crDoc
  CrystalReportViewer1.DataBind()

After deploying my project to Windows 2008 server - report is not displayed on my aspx page.
To fix it
- copy  aspnet_client folder from your local machine into server.