Hi,

I was very pleased to have completed my DNN 4.4.0 install so quickly with our new web host. However, after install I soon received an error which has now twice completely messed up my installation. Here's what happened.

First, I updated the passwords for host and admin. Then, I simply changed the skin to another option, the 'vertical menu full width'. BOTH times I did this, I've received a terminal error:

An error has occurred.
DotNetNuke.Services.Exceptions.PageLoadException: Value cannot be null. Parameter name: type ---> System.ArgumentNullException: Value cannot be null. Parameter name: type at System.Activator.CreateInstance(Type type, Boolean nonPublic) at DotNetNuke.Framework.Reflection.CreateObject(String TypeName, String CacheKey, Boolean UseCache) at DotNetNuke.Framework.Reflection.CreateObject(String ObjectProviderType, String ObjectProviderName, String ObjectNamespace, String ObjectAssemblyName, Boolean UseCache) at DotNetNuke.Modules.NavigationProvider.NavigationProvider.Instance(String FriendlyName) at DotNetNuke.UI.Skins.NavObjectBase.InitializeNavControl(Control objParent, String strDefaultProvider) at DotNetNuke.UI.Skins.Controls.TreeViewMenu.OnInit(EventArgs e) at System.Web.UI.Control.InitRecursive(Control namingContainer) at System.Web.UI.Control.InitRecursive(Control namingContainer) at System.Web.UI.Control.InitRecursive(Control namingContainer) at System.Web.UI.Control.AddedControl(Control control, Int32 index) at System.Web.UI.ControlCollection.Add(Control child) at DotNetNuke.Framework.DefaultPage.Page_Init(Object sender, EventArgs e) at System.Web.UI.Control.OnInit(EventArgs e) at System.Web.UI.Page.OnInit(EventArgs e) at DotNetNuke.Framework.PageBase.OnInit(EventArgs e) at System.Web.UI.Control.InitRecursive(Control namingContainer) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) --- End of inner exception stack trace ---

The URL went to:
http://my.submdomain.107.webhostforasp.net/Default.aspx?tabid=49&error=Value+cannot+be+null.%0d%0aParameter+name%3a+type&content=0

________

Now, I cannot access a single page - either being logged in or not. The error I get now that I have logged out is simply:

"An error has occurred.
An error has occurred."

I cannot seem to fix this problem without uninstalling, again. What is causing this error, and how can I fix it??? Thank you in advance.

Hi,

I have the same problem. After finally being able to install it on a remote hosting, changed the menu from horizontal to vertical, and the site died... displayes only a red ! and "An error has occurred.
An error has occurred." and the url redirects to /Default.aspx?tabid=36&error=Value+cannot+be+null.%0d%0aParameter+name%3a+type&content=0 . I don't even know how to login anymore. Do I need to deleted everything and reinstall?? can I somehow clear the database? some other suggestions?