Hello. After trying to upgrade 5.2.1 to 5.06.03 and then rolling back to backup, I have received this error:


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.Entities.Tabs.TabController.GetTabByTabPath(Int32 portalId, String tabPath) +15
DotNetNuke.HttpModules.UrlRewriteModule.RewriteUrl(HttpApplication app) +3600
DotNetNuke.HttpModules.UrlRewriteModule.OnBeginRequest(Object s, EventArgs e) +1291
System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +68
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75




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Version Information: Microsoft .NET Framework Version:2.0.50727.5466; ASP.NET Version:2.0.50727.5471

***Thanks for any help on this. The website is running on a Windows 2008 R2 Server with Plesk v 11