What the heck do I do with this error?  I don't have the knowledge to even start attacking this one...

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:

[NullReferenceException: Object reference not set to an instance of an object.]
   DotNetNuke.Entities.Portals.PortalSettings.GetPortalSettings(Int32 TabId, PortalAliasInfo objPortalAliasInfo) +91
   DotNetNuke.Entities.Portals.PortalSettings..ctor(Int32 tabId, PortalAliasInfo objPortalAliasInfo) +83
   DotNetNuke.HttpModules.UrlRewriteModule.OnBeginRequest(Object s, EventArgs e) +5773
   System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +92
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +64

Server Error in '/DotNetNukeLP' Application.

---

Object reference not set to an instance of an object.

I tried taking the trailing semicolons off the logins and it made no difference. 

We are wondering if there is a caching error as sometimes it comes back quickly and sometimes it takes noticeably longer to fail.  We've installed the SQL management console to confirm SQL server logins and that is set up properly.

Another interesting fact is that every once in a while, when we try to access it, we get the below message, then when we 'refresh' we go back to the initial problem.

We have spent the last entire day trying to get this to work.

Nothing To Install At This Time

Current Assembly Version: 04.04.01

Current Database Version: 04.04.01