Guys, are you using C# or VB.NET ?
Is the website using the original structure of Visual Studio 2005 or WAP (Web Application Proyect) ?
I am using the original structure of Visual Studio 2005 and VB.NET and I was dealing with this error for a long time.
But I could solve it, linking the cutechat global.asax.cs file to my global.asax the following way:
<%
@ Application Language="VB" Inherits="LiveSupportWeb.Global" %>
Something is for sure, those error messages are for problems with the global.asax