Bonjour à tous je viens de mettre un site en ligne , le serveur est en framework 2.0 et j'ai cette erreur :

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 'System.Web.DynamicData, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.

Source Error:

Line 47: <add assembly="System.Data.DataSetExtensions, Version=3.5.0.0, Culture=neutral,
PublicKeyToken=B77A5C561934E089"/>
Line 48: <add assembly="System.Xml.Linq, Version=3.5.0.0, Culture=neutral,
PublicKeyToken=B77A5C561934E089"/>
Line 49: <add assembly="System.Web.DynamicData, Version=4.0.0.0, Culture=neutral,
PublicKeyToken=31BF3856AD364E35"/>
Line 50: <add assembly="System.Web.Extensions, Version=4.0.0.0, Culture=neutral,
PublicKeyToken=31BF3856AD364E35"/>
Line 51: <add assembly="System.Web, Version=4.0.0.0, Culture=neutral,
PublicKeyToken=B03F5F7F11D50A3A"/>

D'avance merci