Telerik.Web.UI.RadComboBoxEventArgs has already been registered

[Brad]

What could be causing this error?

Sys.InvalidOperationException: Type Telerik.Web.UI.RadComboBoxEventArgs has already been registered. The type may be defined multiple times or the script file that defines it may have already been loaded. A possible cause is a change of settings during a partial update.

if (Sys.__registeredTypes[typeName...Res.typeRegisteredTwice, typeName));

You can see the error in Firebug  here

[Brad]

Fixed.. I found the problem..

Thinking it was needed when I implemented a RadComboBox on my page I added this.

<script src="../Scripts/RadComboBoxScripts.js" type="text/javascript"></script>

Problem be gone.