I am recieving the following error when I attempt to handel an exception.  within a try/catch block I am throwing a simple exception to make sure I setup error checking correctly.  When the error is caught and passed to the block I get this error.

try
{
  throw new Exception("test error logging");
  //...
  status = Status.Success;
}
catch (Exception e) 
{
  ExceptionPolicy.HandleException(e, "Report Exception Policy");
  status = Status.Fail;
}

This is what I have done so far:

1. Downloaded EntLib 2.0
2. Executed .exe download
3. Run Build Enterprise Library
4. Run Copy Assemblies to Bin Folder
5. Run Install Instrumentation
6. Add assemblies to the registry
7. Open VS2005/My Solution
8. Added Error Handeling and Logging Application Block to bin directory which loaded:
1. ErrorHandeling.dll
2. Logging.dll
3. Common.dll
4. ObjectBuilder.dll
9. Configured the Web.Config file via the Enterprise Library Configuation tool

I added the code above and I get

System.TypeInitializationException was unhandled by user code
  Message="The type initializer for 'Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.ExceptionPolicy' threw an exception."
  Source="Microsoft.Practices.EnterpriseLibrary.ExceptionHandling"
  TypeName="Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.ExceptionPolicy"
  StackTrace:
       at Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.ExceptionPolicy.HandleException(Exception exceptionToHandle, String policyName)
       at SBI.SalesReports.BLL.Report.GenerateReport() in c:\JMeckley\My Documents\Visual Studio 2005\WebSites\SalesReports\App_Code\BLL\Report.cs:line 61
       at _Default.wizReportGenerator_FinishButtonClick(Object sender, WizardNavigationEventArgs e) in c:\JMeckley\My Documents\Visual Studio 2005\WebSites\SalesReports\StandardReports\Default.aspx.cs:line 102
       at System.Web.UI.WebControls.Wizard.OnFinishButtonClick(WizardNavigationEventArgs e)
       at System.Web.UI.WebControls.Wizard.OnBubbleEvent(Object source, EventArgs e)
       at System.Web.UI.WebControls.Wizard.WizardChildTable.OnBubbleEvent(Object source, EventArgs args)
       at System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args)
       at System.Web.UI.WebControls.Button.OnCommand(CommandEventArgs e)
       at System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument)
       at System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument)
       at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument)
       at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)
       at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

I have most of the the problem resolved.  First, I included the ErrorHandeling.Logging.dll file which was missing.  Then I began testing different scenarios including

1. When exceptions were thrown
2. Which exception was thrown
3. How to handel the exception

I found the following code will produce my desired results:

void Application_Error(object sender, EventArgs e) 
{ 
    // Code that runs when an unhandled error occurs
    Exception ex = Server.GetLastError();
    if (!string.IsNullOrEmpty(ex.Message))
    {
        ExceptionPolicy.HandleException(ex, "Unhandeled Exception Policy");
        //Response.Redirect("Error/error.aspx");
    }
}

But why do I need the If statement?  After further testing I believe I know what the problem is.  A System.Web.HttpException is thrown at

System.Web.CachedPathData.GetConfigPathData(String configPath)\r\n   at System.Web.CachedPathData.GetVirtualPathData(VirtualPath virtualPath, Boolean permitPathsOutsideApp)\r\n   at System.Web.HttpContext.GetFilePathData()\r\n   at System.Web.HttpContext.GetConfigurationPathData()\r\n   at System.Web.HttpContext.GetRuntimeConfig()\r\n   at System.Web.Configuration.RuntimeConfig.GetConfig(HttpContext context)\r\n   at System.Web.ClientImpersonationContext.Start(HttpContext context, Boolean throwOnError)\r\n   at System.Web.ClientImpersonationContext..ctor(HttpContext context)\r\n   at System.Web.HttpApplication.OnThreadEnter()\r\n   at System.Web.HttpApplication.ResumeSteps(Exception error)

This is actually thrown twice in a row.  I am using the CSSControlAdapters to reformat TreeViewControls. The exceptions are only thrown on pages containing this control.  This may also effect other adapters, currently I am only working with the TreeView. So now my next step is to figure out what is causing the errors.

Try addding this line to your web.config it might solve your problem:

<dataConfiguration defaultDatabase="YourConnectionString" />

I am getting the similar error ..

I have included Microsoft.Practices.EnterpriseLibrary.ExceptionHandling;
using Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.Logging;

But still getting the same error. 

This error as been resolved by Inncluding the .dll file of correct version ie. of 3.1 but I am coming acrosss one more error

The configuration for TraceListener named Database Log Destination is missing from configuration

Can some one please help. ?