IIS 7.5 – Parser Error Message: Could not load file or assembly Microsoft.ReportViewer.WebForms

When deploying a new application to IIS 7.5 on Windows Server 2008 R2 (test server). I got the following error:
Server Error in '/' Application.
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Configuration Error


Description: An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately.


Parser Error Message: Could not load file or assembly 'Microsoft.ReportViewer.WebForms, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.


Source Error:


Line 24: <add assembly="System.Web.Extensions.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
Line 25: <add assembly="System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
Line 26: <add assembly="Microsoft.ReportViewer.WebForms, Version=10.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" />
Line 27: <add assembly="Microsoft.ReportViewer.Common, Version=10.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" />
Line 28: <add assembly="Microsoft.Build.Framework, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" />


Source File: C:\inetpub\wwwroot\web.config Line: 26


Assembly Load Trace: The following information can be helpful to determine why the assembly 'Microsoft.ReportViewer.WebForms, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' could not be loaded.


WRN: Assembly binding logging is turned OFF.
To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1.
Note: There is some performance penalty associated with assembly bind failure logging.
To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog].


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Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.1

Parser Error Message: Could not load file or assembly 'Microsoft.ReportViewer.WebForms...

I forgot to install Microsoft ReportViewer 2010 Redistributable.

It also can be installed from the following location:
C:\Program Files\Microsoft SDKs\Windows\v7.0A\Bootstrapper\Packages\ReportViewer\ReportViewer.exe

Microsoft Report Viewer 2010 Redistributable Package Setup is easy 3 step process:

Microsoft Report Viewer 2010 Redistributable Package Setup
Microsoft Report Viewer 2010 Redistributable Package Setup 2
Microsoft Report Viewer 2010 Redistributable Package Setup Finished

9 thoughts on “IIS 7.5 – Parser Error Message: Could not load file or assembly Microsoft.ReportViewer.WebForms”

  1. You also add the reference Microsoft.ReportViewer.WebForms then set properties ‘copy to local’ to true.

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