Crystalreportviewer error in ASP.net

When I drop a CrystalReportViewer on a ASP.net web form it will error out with:



Server Error in '/PatientReportingSystem' Application.
--------------------------------------------------------------------------------

Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[NullReferenceException: Object reference not set to an instance of an object.]
CrystalDecisions.Web.
.get_9()
CrystalDecisions.Web.CrystalReportViewer.OnInit(EventArgs e)
System.Web.UI.Control.InitRecursive(Control namingContainer) +235
System.Web.UI.Control.InitRecursive(Control namingContainer) +179
System.Web.UI.Control.InitRecursive(Control namingContainer) +179
System.Web.UI.Page.ProcessRequestMain() +171



Anybody know what the hell is going on. This is much simpler in .Net windows app.

Do you have crystal report server running on the server?