This one plagued me for hours. Hope this solution finds you well. The base class includes the field 'ReportViewer1', but its type (Microsoft.Reporting.WebForms.ReportViewer) is not compatible with the type of control (Microsoft.Reporting.WebForms.ReportViewer).
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So I have not embeded many reports in ASP.NET web sites to date so I am a little late on this news. I finally added a report to a ASP.NET 3.5 web site and used the Report Viewer control. After deploying the control I received this message: Could not load
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