Object reference not set to an instance of an object.请教, 这是涉及那方面的错误啊?谢谢!

I uploaded dotnetnuke 2.0.4 to remote server,but meet following error,please advise,thanks a lot.


Server Error in '/' Application.
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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.]
   DotNetNuke.Globals.ApplicationURL() +54
   DotNetNuke.BasePage.Page_Error(Object Source, EventArgs e) +38
   System.Web.UI.TemplateControl.OnError(EventArgs e) +109
   System.Web.UI.Page.HandleError(Exception e) +68
   System.Web.UI.Page.ProcessRequestMain() +2063
   System.Web.UI.Page.ProcessRequest() +217
   System.Web.UI.Page.ProcessRequest(HttpContext context) +18
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication+IExecutionStep.Execute() +179
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +87

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