Object Reference Not Set error using CrystalReportViewer

Question

I have a web application in which I am attempting to use the CrystalReportViewer.  Using Visual Studio 2008, I was able to get the viewer to run and display reports just fine.  But since I moved to Visual Studio 2010, I've been unable to get it working again.  I reinstalled Crystal Reports for Visual Studio 2010 and the x64 runtime.  I created a test aspx page with just the following content:
using CrystalDecisions.Web;
public partial class Test : System.Web.UI.Page
    protected void Page_Load(object sender, EventArgs e)
         CrystalReportViewer Viewer = new CrystalReportViewer();
        Viewer.ID = "viewer";
        ph.Controls.Add( Viewer );
When I load the page, I get this exception:
NullReferenceException: Object reference not set to an instance of an object.
   CrystalDecisions.Web.ViewerGlobal.get_IsNetscape6Up() +88
   CrystalDecisions.Web.CrystalReportViewer.Render(HtmlTextWriter output) +83
This is a server-side exception, so I'm pretty sure that my browser has nothing to do with it, but I've tried this in both Chrome and IE8.
Do I have a screwy install?  Or is there something I'm neglecting to do to configure the ReportViewer that's new in 2010?
Thanks for your help,
-Steve

Answer 1

I figured it out.
I had already tried adding a new aspx page as David suggested before, and that did not work.  So this time I made a whole new "ASP.NET Crystal Reports Web Site" project in my solution, which was nice enough to make a default aspx page with a built in crystal report viewer tied to a new report .rpt file in the project.  And believe it or not, it worked flawlessly.
The use of CrystalReportViewer was different but relatively equivalent in both cases.  So then I started analyzing the differences between this new project's web.config and mine.  After some painstaking troubleshooting, I determined the problem: someone on my team had added some new content to the web.config, which included these lines:
<system.webServer>
  <modules>
    <remove name="Detector" />
    <add name="Detector" type="FiftyOne.Foundation.Mobile.Detection.DetectorModule, FiftyOne.Foundation"/>
  </modules>
</system.webServer>
I'm assuming that Crystal also uses a module called "Detector" in get_IsNetscape6Up(), and that this code was overriding that module.
It's still not working quite right, but at least I'm past this error and on to the next one.
I appreciate the help, Don and David!
Thanks,
-Steve