cant reference dll file in bin folder

hello friends

I'm using ASP.NET 1.1

I'm getting the following error upon referencing a dll file in bin folder

Server Error in '/' Application.
Parser Error
Description: An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately.

Parser Error Message: File or assembly name authenticate, or one of its dependencies, was not found.

Source Error:

Line 1: <%@ Page Language="C#" autoeventwireup="true" Src="login.aspx.cs" Inherits="login" %>
Line 2: <%@ Assembly Name ="authenticate" %>
Line 3: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
Line 4: <html xmlns="http://www.w3.org/1999/xhtml">

Source File: C:\Inetpub\wwwroot\cert\login.aspx Line: 2

Assembly Load Trace: The following information can be helpful to determine why the assembly 'authenticate' could not be loaded.

=== Pre-bind state information ===
LOG: DisplayName = authenticate
(Partial)
LOG: Appbase = file:///C:/Inetpub/wwwroot
LOG: Initial PrivatePath = bin
Calling assembly : (Unknown).
===

LOG: Policy not being applied to reference at this time (private, custom, partial, or location-based assembly bind).
LOG: Post-policy reference: authenticate
LOG: Attempting download of new URL file:///c:/windows/microsoft.net/framework/v1.1.4322/Temporary ASP.NET Files/root/8073f566/7100ac34/authenticate.DLL.
LOG: Attempting download of new URL file:///c:/windows/microsoft.net/framework/v1.1.4322/Temporary ASP.NET Files/root/8073f566/7100ac34/authenticate/authenticate.DLL.
LOG: Attempting download of new URL file:///C:/Inetpub/wwwroot/bin/authenticate.DLL.
LOG: Attempting download of new URL file:///C:/Inetpub/wwwroot/bin/authenticate/authenticate.DLL.
LOG: Attempting download of new URL file:///c:/windows/microsoft.net/framework/v1.1.4322/Temporary ASP.NET Files/root/8073f566/7100ac34/authenticate.EXE.
LOG: Attempting download of new URL file:///c:/windows/microsoft.net/framework/v1.1.4322/Temporary ASP.NET Files/root/8073f566/7100ac34/authenticate/authenticate.EXE.
LOG: Attempting download of new URL file:///C:/Inetpub/wwwroot/bin/authenticate.EXE.
LOG: Attempting download of new URL file:///C:/Inetpub/wwwroot/bin/authenticate/authenticate.EXE.

Version Information: Microsoft .NET Framework Version:1.1.4322.2300; ASP.NET Version:1.1.4322.2300

PLease help
[2684 byte] By [bluehat] at [2007-11-20 9:11:16]