owin Error on first run after installing a customers site umbraco 7 site
<p>I get this error on a 7.3 umbraco build:</p>

<blockquote>
  <p>The following errors occurred while attempting to load the app. -
  The OwinStartupAttribute.FriendlyName value
  'UmbracoDefaultOwinStartup' does not match the given value '' in
  Assembly 'umbraco, Version=1.0.5750.18164, Culture=neutral,
  PublicKeyToken=null'. - No assembly found containing a Startup or
  [AssemblyName].Startup class. To disable OWIN startup discovery, add
  the appSetting owin:AutomaticAppStartup with a value of "false" in
  your web.config. To specify the OWIN startup Assembly, Class, or
  Method, add the appSetting owin:AppStartup with the fully qualified
  startup class or configuration method name in your web.config.</p>
</blockquote>

<p>Any ideas? I've even removed owin.dll from the bin folder and the reference from the solution, also added to the web.config <code>&lt;add key="owin:AutomaticAppStartup" value="false" /&gt;</code> and still get the same error?</p>

<p>Thanks</p>