Hi,

we are trying to upgrade from 4.8.0 to the latest version of DNN.

we are following the suggested upgrade path in this link: http://www.dnnsoftware.com/wiki/suggested-upgrade-path

When upgrading from 4.9.5 to 5.4.4 installation fails.
So we tried to upgrade each version after 4.9.5 and it works until 5.4.1.
Following this path with minor issues we have a stable 5.4.1.

When upgrading to 5.4.2 we have this error:
"DotNetNuke.Services.Exceptions.PageLoadException: Object reference not set to an instance of an object. ---> System.NullReferenceException: Object reference not set to an instance of an object. in DotNetNuke.Framework.jQuery.RegisterScript(Page page, String script) in DotNetNuke.Framework.jQuery.RegisterScript(Page page) in DotNetNuke.Framework.DefaultPage.Page_PreRender(Object sender, EventArgs e) in D:\WorkSpace\www.acme.local\Default.aspx.vb:line 610 in System.EventHandler.Invoke(Object sender, EventArgs e) in System.Web.UI.Control.OnPreRender(EventArgs e) in DotNetNuke.Framework.PageBase.OnPreRender(EventArgs evt) in System.Web.UI.Control.PreRenderRecursiveInternal() in System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) "

We have only default DNN modules.

We are stuck, how can I investigate this error?

Thank you