Hi there

I am trying to wire up a Rest Extension but am having no luck - I have coded \base functionality before with no problems and this is making me pull my hair out (what's left of it).

The error message is;

The page cannot be displayed because an internal server error has occurred.

My code is

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Xml;
using umbraco.presentation.umbracobase;

namespace Foodstuffs.Umbraco.Trents
{
    [RestExtension("restExt")]
    public class RestHelper
    {
        [RestExtensionMethod()]
        public static string CheckCustomerNumber(string custNo)
        {
            ...
        }
        
    }
}

I am trying to call the rest extension via the following URL:

http://myURL/base/restExt/CheckCustomerNumber/123.aspx

I have tried using a capital B in base too but that didn't work either

Please, please, please tell me what obvious piece of the puzzle I am missing...

Nigel