API people! I am getting this error in TEST when trying to send a Forgot Password or Order Confirmation. It's the same setup as in LIVE and I don't know what's causing it! Any brilliant ideas from those of you who use the API?

Server Error in '/TESTAPI' Application. 

Compilation Error

Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately. 
Compiler Error Message: CS0246: The type or namespace name 'TNEW' could not be found (are you missing a using directive or an assembly reference?)
Source Error:

Line 1:  <%@ Page Language="C#" Inherits="Tessitura.WebAPI.Controls.LoginEmailPage" %>
Line 2:  <%@ Import Namespace="TNEW.Objects" %>
Line 3:  <%
Line 4:      // initialize TNEW cart email data

Source File: c:\ClientAPISites\BAUS\TESTAPI\SOAPAPI\templates\TNExpress_ForgotLogin_html.aspx    Line: 2