The type 'Microsoft.Reporting.WebForms.ReportViewer' exists in both

Question

I have one SSRS Report using SOAP in sharepoint.In my viaual studio code it is showing one error.

The type.Microsoft.Reporting.WebForms.IReportServerCredentials.exists.in both c:\Windows\assembly\GAC-MSIL\Microsoft.ReportViewer.WebForms\12.0.0.0-89845dcd8080cc91\Microsoft.Reportviewer.WebForms.DLL and c:\Windows\assembly\GAC-MSIL\Microsoft.ReportViewer.WebForms\10.0.0.0-b03f5f7f11d50a3a\Microsoft.ReportViewer.WebForms.dll"

I tried to add qualifyAssembly node in web.config.But it is not working.Visual studio version is 2015.I am using sharepoint 2016 onpremise.
How to solve it?

Answer 1

Hi @Bharathi Paulraj ,

According to my research , try to remove one from the web.config file, for example:

<add namespace="Microsoft.Reporting.WebForms" assembly="Microsoft.ReportViewer.WebForms, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" tagPrefix="Reporting"/>  

Similar issue : https://social.msdn.microsoft.com/Forums/en-US/c46c8efc-c5f9-4785-a9c0-f9946a17db54/the-type-microsoftreportingwebformsreportviewer?forum=aspsqlserverreporting

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