Server Error in '/' Application.
Could not load type 'System.Data.Entity.DynamicProxies.Employees_31D5D8E22BDA1BDE7633258E0B872E10BE53EA325E44C778D3924FDEDFBCE14F' from assembly 'EntityFrameworkDynamicProxies-CTS, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.Exception Details: System.TypeLoadException: Could not load type 'System.Data.Entity.DynamicProxies.Employees_31D5D8E22BDA1BDE7633258E0B872E10BE53EA325E44C778D3924FDEDFBCE14F' from assembly 'EntityFrameworkDynamicProxies-CTS, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
Solution:
In your entity datasource, set the value EnableFlattening="False"
Example:
<asp:EntityDataSource ID="EntityDataSource1" runat="server" ConnectionString="name=XXXXXEntities" DefaultContainerName="XXXXXEntities" EnableFlattening="False" EntitySetName="Employees" Include="Nationalities,Locations" EntityTypeFilter="Employees" OrderBy="it.[EmployeeID]">
</asp:EntityDataSource>
