Parser error in IIS in viewing reports

Description: An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately.

Parser Error Message: Could not load file or assembly 'Microsoft.ReportViewer.WebForms, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.

Assembly Load Trace: The following information can be helpful to determine why the assembly 'Microsoft.ReportViewer.WebForms, Version=8.0.0.0, 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].

Issue : missing report viewer

Solution : Download installation package from below link and install.

http://www.microsoft.com/downloads/details.aspx?familyid=8A166CAC-758D-45C8-B637-DD7726E61367&displaylang=en

Below Thread gives more information

https://social.msdn.microsoft.com/Forums/en-US/d5d438e2-48ee-4525-8e85-f2cc0ede879b/configuration-error-could-not-load-file-or-assembly-microsoftreportviewerwebforms?forum=tfswebaccess