Enterprise library error
<p>I keep getting this error when I run my application, sometimes its goes away, but sometimes it appears again.</p>

<blockquote>
  <p>System.IO.FileLoadException: Could not load file or assembly 'Microsoft.Practices.EnterpriseLibrary.Common, Version=5.0.414.0,
  Culture=neutral, PublicKeyToken=null' or one of its dependencies. 
      The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040) 
      File name: 'Microsoft.Practices.EnterpriseLibrary.Common, Version=5.0.414.0, Culture=neutral, PublicKeyToken=null' 
      at System.ModuleHandle.ResolveType(RuntimeModule module, Int32 typeToken, IntPtr* typeInstArgs, Int32 typeInstCount, IntPtr*
  methodInstArgs, Int32 methodInstCount, ObjectHandleOnStack type) 
      at System.ModuleHandle.ResolveTypeHandleInternal(RuntimeModule module, Int32 typeToken, RuntimeTypeHandle[] typeInstantiationContext,
  RuntimeTypeHandle[] methodInstantiationContext) 
      at System.Reflection.RuntimeModule.ResolveType(Int32 metadataToken, Type[] genericTypeArguments, Type[]
  genericMethodArguments)</p>
</blockquote>
