Hi, I get this error when i try to make a new node. It is only one node type that has this problem, all other are fine.

Please help :-)

Umbraco v6.1.5 (Assembly version: 1.0.4993.19246)

Server Error in '/' Application.

An item with the same key has already been added.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.ArgumentException: An item with the same key has already been added.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[ArgumentException: An item with the same key has already been added.] System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add) +14175344
umbraco.controls.ContentControl.AddControlNew(Property p, TabPage tp, String cap) +285
umbraco.controls.ContentControl.LoadPropertyTypes(IContentTypeComposition contentType, TabPage tabPage, Hashtable inTab, Int32 tabId, String tabCaption) +360
umbraco.controls.ContentControl.CreateChildControls() +710
System.Web.UI.Control.EnsureChildControls() +189
umbraco.controls.ContentControl.OnInit(EventArgs e) +51
System.Web.UI.Control.InitRecursive(Control namingContainer) +186
System.Web.UI.Control.AddedControl(Control control, Int32 index) +189 umbraco.cms.presentation.editContent.OnInit(EventArgs e) +1263
System.Web.UI.Control.InitRecursive(Control namingContainer) +186
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2098

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.18045

Thank you :-)