element null error
<p>I'm getting this error, not really sure why. Please help, this is urgent.</p>

<p>UPDATE</p>

<pre><code>if (flights.Count() &gt;= 1)
        {
            int count = flights.Count();
            lblNumResults.Text = count.ToString();
            gvAvailableFlights.DataSource = flights;
            gvAvailableFlights.DataBind();
        }
</code></pre>

<blockquote>
  <p>Server Error in '/WebSite3'
  Application. Value cannot be null.
  Parameter name: element Description:
  An unhandled exception occurred during
  the execution of the current web
  request. Please review the stack trace
  for more information about the error
  and where it originated in the code.</p>
  
  <p>Exception Details:
  System.ArgumentNullException: Value
  cannot be null. Parameter name:
  element</p>
  
  <p>Source Error:</p>
  
  <p>The source code that generated this
  unhandled exception can only be shown
  when compiled in debug mode. To enable
  this, please follow one of the below
  steps, then request the URL:</p>
  
  <ol>
  <li><p>Add a "Debug=true" directive at the top of the file that generated the
  error. Example:</p>
  
  <p>&lt;%@ Page Language="C#" Debug="true"
  %></p></li>
  </ol>
  
  <p>or:</p>
  
  <p>2) Add the following section to the
  configuration file of your
  application:</p>
  
  <p>    
              </p>
  
  <p>Note that this second technique will
  cause all files within a given
  application to be compiled in debug
  mode. The first technique will cause
  only that particular file to be
  compiled in debug mode.</p>
  
  <p>Important: Running applications in
  debug mode does incur a
  memory/performance overhead. You
  should make sure that an application
  has debugging disabled before
  deploying into production scenario.</p>
  
  <p>Stack Trace:</p>
  
  <p>[ArgumentNullException: Value cannot
  be null. Parameter name: element]<br>
  System.Xml.Linq.XElement.op_Explicit(XElement
  element) +116474<br>
  searchresult.b__1d(XElement
  f) +64<br>
  System.Linq.WhereSelectEnumerableIterator<code>2.MoveNext()
  +151    System.Linq.Enumerable.Count(IEnumerable</code>1
  source) +201<br>
  searchresult.FillAvailableFlightsGridView()
  +721    searchresult.Page_Load(Object sender, EventArgs e) +37<br>
  System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr
  fp, Object o, Object t, EventArgs e)
  +14    System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object
  sender, EventArgs e) +35<br>
  System.Web.UI.Control.OnLoad(EventArgs
  e) +91<br>
  System.Web.UI.Control.LoadRecursive()
  +74    System.Web.UI.Page.ProcessRequestMain(Boolean
  includeStagesBeforeAsyncPoint, Boolean
  includeStagesAfterAsyncPoint) +2207</p>
  
  <p>Version Information: Microsoft .NET
  Framework Version:4.0.30319; ASP.NET
  Version:4.0.30319.1</p>
</blockquote>
