Web application - Getting an error after migrating VS2012 to VS2013 .

Hi,
I have installed VS2013 and opened my project.
So web.config automatically added 
<add assembly="System.Spatial, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" /> <add assembly="Microsoft.Data.Edm, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" /> <add assembly="Microsoft.Data.OData, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" /> <add assembly="Microsoft.Data.Services.Client, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" /> <add assembly="Microsoft.Data.Services, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
and giving compile error :
"Could not load file or assembly 'System.Spatial, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified ...