Parser error

I have finished developing my company web site and published it and it works fine, But when they need changes..So I make the changes and published it again, then i have this error raisedOn my local machine when i run the debugger every thing seems to be okBut on internet it generates this error

Server Error in '/' Application.

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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:Could not load file or assembly 'AjaxControlToolkit' or one of its dependencies. The module was expected to contain an assembly manifest.

Source Error:

Line 1: <%@dotnet.itags.org. Page Language="VB" MasterPageFile="~/ServicesMaster.master" Title=" Global Maintenance Agreements " %>

Line 2: 

Line 3: <%@dotnet.itags.org. Register

Line 4:  Assembly="AjaxControlToolkit"

Line 5:  Namespace="AjaxControlToolkit"

Source File:/Global Maintenance Agreements.aspx Line:3

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

WRN: Assembly binding logging is turned OFF.

To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1.

Note: There is some performance penalty associated with assembly bind failure logging.

To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog].

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Version Information: Microsoft .NET Framework Version:2.0.50727.42; ASP.NET Version:2.0.50727.42 does anybody has a solution?

try to install the ASP AJAX Extension on the IIS

http://asp.net/ajax/downloads/

I already did so from the begginning of the development and it works fine on the local server on my machine

try to reset the iis after installation iisreset from run command line

Please make sure the assembly AjaxControlToolkit.dll is contained in the bin folder of your application.