title: Reporting Services LocalReport and WIF
body: <p>I have a wcf webservice that uses WIF for authentication. Part of the responsibility of this webservice is to generate a report and email it. If I render the report with data only everything is fine. If I include any report parameters, report constants, or even just DateTime.Now I get the following exception:  </p>
  
  <pre><code>An error occurred during local report processing.Failed to load expression host assembly. Details: Request for the permission of type 'System.Security.Permissions.SecurityPermission, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed
  </code></pre>
  
  <p>I can run the same report in a WCF service that does not use WIF, so clearly something about the security environment is fubarred.</p>
  
  <p>I really don't know how to proceed with solving this problem. Can anyone help?
  Thanks!</p>