Dear all,

I upgraded step by step from DNN 4.9 via 5.4.4, 5.5.1, 5.6.4, 6.1.3 , 6.2.6 to 6.2.9 . Everything seems to work fine, apart from the fact that when I try to open the site settings the following error occurs:

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An error has occurred.DotNetNuke.Services.Exceptions.PageLoadException: An error has occurred. ---> DotNetNuke.Services.Exceptions.PageLoadException: An error has occurred. ---> DotNetNuke.Services.Exceptions.PageLoadException: An error has occurred. ---> DotNetNuke.Services.Exceptions.ModuleLoadException: An error has occurred. ---> System.NullReferenceException: Object reference not set to an instance of an object. at DotNetNuke.UI.Containers.ActionBase.get_ModuleContext() at DotNetNuke.UI.Containers.ActionBase.get_ActionRoot() at DotNetNuke.UI.Containers.ActionBase.OnLoad(EventArgs e) --- End of inner exception stack trace --- at DotNetNuke.Services.Exceptions.Exceptions.ProcessModuleLoadException(String FriendlyMessage, Control ctrl, Exception exc, Boolean DisplayErrorMessage) --- End of inner exception stack trace --- at DotNetNuke.Services.Exceptions.Exceptions.ProcessPageLoadException(Exception exc, String URL) at DotNetNuke.Services.Exceptions.Exceptions.ProcessPageLoadException(Exception exc) at DotNetNuke.Services.Exceptions.Exceptions.ProcessModuleLoadException(String FriendlyMessage, Control ctrl, Exception exc, Boolean DisplayErrorMessage) at DotNetNuke.Services.Exceptions.Exceptions.ProcessModuleLoadException(Control ctrl, Exception exc, Boolean DisplayErrorMessage) at DotNetNuke.Services.Exceptions.Exceptions.ProcessModuleLoadException(Control ctrl, Exception exc) at DotNetNuke.UI.Containers.ActionBase.OnLoad(EventArgs e) at DotNetNuke.UI.WebControls.SolPartActions.OnLoad(EventArgs e) at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) --- End of inner exception stack trace --- at DotNetNuke.Services.Exceptions.Exceptions.ProcessPageLoadException(Exception exc, String URL) at DotNetNuke.Framework.PageBase.OnError(EventArgs e) at System.Web.UI.Page.HandleError(Exception e) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) at System.Web.UI.Page.ProcessRequest() at System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) at System.Web.UI.Page.ProcessRequest(HttpContext context) at ASP.default_aspx.ProcessRequest(HttpContext context) at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) --- End of inner exception stack trace ---

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I tried some suggestions I found in forums, like checking on installed files, reinstalling radeditor etc, but without any succes.   

Any suggestions? I'd like to solve it before moving on to version 7.