'ReportViewer' is ambiguous in the namespace

[Michael]

I upgraded from Q3 2009 to Q3 2009 SP1 (1211) and now I get the following error anytime I try to open a report
System.Web.HttpCompileException = {"C:\PMB\Integration\Certificate\printCEcertificate.aspx(48): error BC30560: 'ReportViewer' is ambiguous in the namespace 'Telerik.ReportViewer.WebForms'."}
Any Ideas?

Nevermind, I still had the old versions in my Bin folder.

[Steve]

Hello Michael,

Have you updated the reporting assemblies in the bin folder - i.e. remove the previous version and add the new one?

All the best,
Steve
the Telerik team

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[Charlie]

I had to upgrade from 3.5 to 4.0 because I am taking code over from another firm.  However, I am getting 6 errors all worded: 

Error 4 'ReportViewer' is ambiguous in the namespace 'Telerik.ReportViewer.WebForms'. C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\be764665\68ad8220\App_Web_3kpcrt5l.4.vb 396 

if I delete the following code







<telerik:ReportViewer runat="server" ID="radViewer" Width="842" Height="1000">
         </telerik:ReportViewer>

and the 
radViewer.Report = report


line...my form becomes not as presentable  How can I put the format in with the new format?

[Steve]

Hi Charlie,

Can you confirm that as outlined in the Best Practices help article, you have created a class library that holds the Telerik Reports instead of adding them directly to your application? Then you've referenced the class library in your web site, so you can use the reports in the viewer. Additionally verify that you're not targeting .NET 4 Client profile framework, which is not supported.

Kind regards,
Steve
the Telerik team