RequiredFieldValidator doesn't fire on Windows 2003 Server

[Matt]

I have created a web app for development requests where every field on
the insert form has to be filled in and so has a
RequiredFieldValidator on it. The app runs great on my development
machine, but when I load it onto the webserver running Windows 2003
Server the validation controls don't work on the insert form, the RFV
on the login form work fine. Everything seems fine but instead of
clicking the submit button and having a bunch of red * next to the
fields, which is what happens on the development machine, I get the
following error message. Any help would be appreciated.

******************************************************************************
Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of
the current web request. Please review the stack trace for more
information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not
set to an instance of an object.

Source Error:

An unhandled exception was generated during the execution of the
current web request. Information regarding the origin and location of
the exception can be identified using the exception stack trace below.

Stack Trace:


[NullReferenceException: Object reference not set to an instance of an
object.]
IntRequest.WebForm1.btnSubmit_Click(Object sender, EventArgs e)
+252
System.Web.UI.WebControls.Button.OnClick(EventArgs e) +108
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String
eventArgument) +57
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler
sourceControl, String eventArgument) +18
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)
+33
System.Web.UI.Page.ProcessRequestMain() +1277

--------------------------------------------------------------------------------
Version Information: Microsoft .NET Framework Version:1.1.4322.573;
ASP.NET Version:1.1.4322.573
********************************************************************************


Thanks for the help.
Matt