I'm very new to DotNetNuke, and having some major issues with the pages I'm working on.

I set up my page a few days ago, using the book "Professional DotNetNuke 4" and followed its instructions exactly. I created a site, and added a few pages to it (including a login page which forces you to login before you can view the other pages).

Now if I try to go to the URL 
http://localhost/dotnetnuke
I get the following error:

Server Error in '/DotNetNuke' Application.

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Object reference not set to an instance of an object.

But if I go to
http://localhost/dotnetnuke/Home/tabid/36/ctl/Module/ModuleId/370/Default.aspx
I get the login page

I'm just wondering if it's ok that the first URL doesn't work, or if there is an issue there I should correct, and if so then how to correct it

Thanks!

Ok this is the error log (sorry I'm super new to this and don't fully understand it):

AssemblyVersion: 04.05.03
PortalID: -1
PortalName:
UserID: -1
UserName:
ActiveTabID: -1
ActiveTabName:
RawURL: /DotNetNuke/ScriptResource.axd?d=Kl-vGywZ33j2jjMgWKzin2Gs2QUbk3gzQHMJcUm4UEyV0qctSeR-U7-uSv8r2467WiaWkL1Ys9E1&t=633202841841127375
AbsoluteURL: /DotNetNuke/ScriptResource.axd
AbsoluteURLReferrer: http://localhost/dotnetnuke/Home/tabid/36/ctl/Module/ModuleId/370/Default.aspx
UserAgent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Tablet PC 1.7; .NET CLR 1.0.3705; .NET CLR 1.1.4322; InfoPath.1; .NET CLR 2.0.50727)
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: d0d4895a-6576-48eb-85e1-a5594aefc41b
InnerException: Unhandled Error:
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: DotNetNuke.Entities.Portals.PortalSettings.VerifyPortalTab
StackTrace:
Message: System.Exception: Unhandled Error: ---> System.NullReferenceException: Object reference not set to an instance of an object. at DotNetNuke.Entities.Portals.PortalSettings.VerifyPortalTab(Int32 PortalId, Int32 TabId) at DotNetNuke.Entities.Portals.PortalSettings.GetPortalSettings(Int32 TabId, PortalAliasInfo objPortalAliasInfo) at DotNetNuke.Entities.Portals.PortalSettings..ctor(Int32 tabId, PortalAliasInfo objPortalAliasInfo) at DotNetNuke.HttpModules.UrlRewriteModule.OnBeginRequest(Object s, EventArgs e) at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) --- End of inner exception stack trace ---
Source:
Server Name: (I cut this name out)

So when I go to http://localhost/dotnetnuke I get the error that is show below, but if I go straight to the URL for the default page I can get in, but then have the postback error.

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:

<pre>[NullReferenceException: Object reference not set to an instance of an object.] DotNetNuke.Entities.Portals.PortalSettings.VerifyPortalTab(Int32 PortalId, Int32 TabId) +319 DotNetNuke.Entities.Portals.PortalSettings.GetPortalSettings(Int32 TabId, PortalAliasInfo objPortalAliasInfo) +2402 DotNetNuke.Entities.Portals.PortalSettings..ctor(Int32 tabId, PortalAliasInfo objPortalAliasInfo) +82 DotNetNuke.HttpModules.UrlRewriteModule.OnBeginRequest(Object s, EventArgs e) +2677 System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +92 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&amp; completedSynchronously) +64</pre>

Server Error in '/DotNetNuke' Application.

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Object reference not set to an instance of an object.