Parser error on redirect?

Parser error on redirect?

I get a parser error when running my code and have checked references but
everything seems in place.The error occurs when on a redirect from a page
The error occurs on line 1.
<%@ Page Title="CreateUser" Language="C#" MasterPageFile="~/Main.Master"
AutoEventWireup="true" CodeBehind="CreateUser.aspx.cs"
Inherits="ICSWebPortal.Portal.Pages.User.CreateUser" PageName="Create
User" PageDescription="Details of user" %>
<%@ MasterType VirtualPath="~/Main.Master" %>
This is my redirect function on another page
function CreateNewUser()
{
window.location = "<% = GetHost() %>/User/Create/"
}