title: "Could not load file or assembly 'Microsoft.Practices.EnterpriseLibrary.Validation" exception
body: <p>I am currently getting the following exception while trying to use the Enterprise Library Validation Application Block:</p>
  
  <p><em>An error occurred creating the configuration section handler for validation: Could not load file or assembly 'Microsoft.Practices.EnterpriseLibrary.Validation, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040) (C:\Documents and Settings\My Documents\Visual Studio 2008\Projects\Testers\TestProject\web.config line 12)</em></p>
  
  <p>I know what the exception is trying to tell me, but I can't figure out how to fix it. I have only ever installed one version of the Enterprise Library, and this is it (4.1.0.0), so I don't see how it could be finding the wrong version, so I imagine it is then a dependency problem. I have included the "Common",  "Validation" and "ObjectBuilder2" DLLs from the Enterprise Library 4.1 as references in the project, so I'm not sure what else I'm missing. The documentation certainly seems to indicate this is all I need.</p>
  
  <p>Is there any way to track down what the dependency problem is?</p>
  
  <p>If it helps, I am trying to use the Enterprise Library Configuration Tool to create a Validation Application Block rule set for validation of data in an Entity Framework entity. I am using ASP.NET MVC in Visual Studio 2008.</p>
  
  <p>Thanks for any assistance/direction you can provide,</p>
  
  <p>Chris</p>