title: Fresh Sitecore install - Handler "AboMapperCustom-88978986" has a bad module "IsapiModule" in its module list
body: <p>I get this error with a fresh Sitecore 6.4 install. </p>
  
  <blockquote>
    <p>HTTP Error 500.21 - Internal Server Error Handler
    "AboMapperCustom-88978986" has a bad module "IsapiModule" in its
    module list</p>
  </blockquote>
  
  <p>Any ideas? AppPool is integreated but i get same error on classic. </p>