Modify WCF Service To Work With .NET Pages?

I created a WCF service (.NET 3.5) that grabs data from a db and returns a list of objects. It works just fine. I tested it using the WCFTestClient application and got the desired results.Now, I tried to create an ASP.NET web application and consume the service. After enabling <serviceDebug includeExceptionDetailInFaults="true"/> in the config file, the error message is "Object reference not set to an instance of an object."How do I modify the service to work with ASP.NET?

Update 1 - I created a reference to the service. When I ran my very basic testing app, based on the sample code displayed on the service's default web page, I got the "Object reference not set to an instance of an object" message.The service is returning the correct results when I use the WCF Test Client utility provided with Visual Studio. When I try to use the following code, all in the page_load event, I get the object reference message.

PhoneNumberServiceClient client = new PhoneNumberServiceClient();
// Use the 'client' variable to call operations on the service
List<PhoneNumber> phones = client.GetPhoneNumbers();

// Always close the client.
client.Close();