I'm using DNN 7.3.4. I got the problem that all the module settings can not display and the site settings can not show up too.

Here is the event view info. Please help!!!

AssemblyVersion:7.3.4

PortalID:0

PortalName:My Website

UserID:1

UserName:host

ActiveTabID:67

ActiveTabName:Site Settings

RawURL:/dnn7/en-us/admin/sitesettings.aspx

AbsoluteURL:/dnn7/Default.aspx

AbsoluteURLReferrer:http://localhost/dnn7/

UserAgent:Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/30.0.1599.101 Safari/537.36

DefaultDataProvider:DotNetNuke.Data.SqlDataProvider, DotNetNuke

ExceptionGUID:ca689d6b-51cc-4140-b15e-f3c83500f0de

InnerException:An item with the same key has already been added.

FileName:

FileLineNumber:0

FileColumnNumber:0

Method:System.Collections.Generic.Dictionary`2.Insert

StackTrace:

Message:

DotNetNuke.Services.Exceptions.PageLoadException: An item with the same key has already been added. ---> System.ArgumentException: An item with the same key has already been added.    at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)    at System.Linq.Enumerable.ToDictionary[TSource,TKey,TElement](IEnumerable`1 source, Func`2 keySelector, Func`2 elementSelector, IEqualityComparer`1 comparer)    at DotNetNuke.Web.UI.WebControls.DnnSkinComboBox.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.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 ---

Source:

Server Name: USER-20140327RC