Crystal report in Web with .net

[neream]

I want to develop one web aplication with .net and Crystal Report.

I have installed Visual Studio.net in my computer but I don't know if i have to install something in the web server.(I was thinking that may be i have to install 'Crystal Reports for Visual Studio .NET' in the server???)

The error I have is:
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_7() +189
CrystalDecisions.Web.CrystalReportViewer.OnInit(EventArgs e) +352
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

[tomasz]

If you can drag the ReportViewer on WebForm without any errors, then you know Crystal.Net is installed properly.