Had to replace 1.2.0.2002 with 1.2.0.4000 of NHibernate.dll.  Binding redirect.

<dependentAssembly>
    <assemblyIdentity name="NHibernate" culture="" publicKeyToken=""/>
    <bindingRedirect oldVersion="1.2.0.2002" newVersion="1.2.0.4000"/>
</dependentAssembly>

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