Open your application's web.config file. Ensure the following handler configuration is present inside the section:
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2. Error: "Could not load file or assembly 'Microsoft.ReportViewer.Common'" Open your application's web
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Go to > NuGet Package Manager > Package Manager Console .
<configuration> <system.web> <httpHandlers> <add verb="*" path="Reserved.ReportViewerWebControl.axd" type="Microsoft.Reporting.WebForms.HttpHandler, Microsoft.ReportViewer.WebForms, Version=12.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" /> </httpHandlers> </system.web> <system.webServer> <handlers> <add name="ReportViewerWebControlHandler" verb="*" path="Reserved.ReportViewerWebControl.axd" type="Microsoft.Reporting.WebForms.HttpHandler, Microsoft.ReportViewer.WebForms, Version=12.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" /> </handlers> </system.webServer> </configuration>
Requires Microsoft .NET Framework 4.0, .NET Framework 4.5, or .NET Framework 4.6.