Installed Umbraco 6 about a week ago, build going well until I come to add another homepage root (multi site / url installation) and I got the following error:

 

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.ThrowHelper.ThrowArgumentException(ExceptionResource resource) +52

   System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add) +10691810

   System.Collections.Generic.Dictionary`2.Add(TKey key, TValue value) +10

   umbraco.controls.ContentControl.AddControlNew(Property p, TabPage tp, String Caption) +218

   umbraco.controls.ContentControl.CreateChildControls() +602

   System.Web.UI.Control.EnsureChildControls() +83

   umbraco.controls.ContentControl.OnInit(EventArgs e) +38

   System.Web.UI.Control.InitRecursive(Control namingContainer) +134

   System.Web.UI.Control.AddedControl(Control control, Int32 index) +191

   System.Web.UI.ControlCollection.Add(Control child) +86

   umbraco.cms.presentation.editContent.OnInit(EventArgs e) +1130

   System.Web.UI.Control.InitRecursive(Control namingContainer) +134

   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +489

 

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.18034

 

 

 

The UmbracoTraceLog.txt file shows:

 

 

 

2013-02-10 12:50:42,251 [43] ERROR Umbraco.Core.UmbracoApplicationBase - [Thread 42] An unhandled exception occurred

 

System.Web.HttpUnhandledException (0x80004005): Exception of type 'System.Web.HttpUnhandledException' was thrown. ---> System.ArgumentException: An item with the same key has already been added.

 

   at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)

 

   at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)

 

   at System.Collections.Generic.Dictionary`2.Add(TKey key, TValue value)

 

   at umbraco.controls.ContentControl.AddControlNew(Property p, TabPage tp, String Caption)

 

   at umbraco.controls.ContentControl.CreateChildControls()

 

   at System.Web.UI.Control.EnsureChildControls()

 

   at umbraco.controls.ContentControl.OnInit(EventArgs e)

 

   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 umbraco.cms.presentation.editContent.OnInit(EventArgs e)

 

   at System.Web.UI.Control.InitRecursive(Control namingContainer)

 

   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

 

   at System.Web.UI.Page.HandleError(Exception e)

 

   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

 

   at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

 

   at System.Web.UI.Page.ProcessRequest()

 

   at System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context)

 

   at System.Web.UI.Page.ProcessRequest(HttpContext context)

 

   at ASP.umbraco_editcontent_aspx.ProcessRequest(HttpContext context) in c:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\dc787942\643abf39\App_Web_editcontent.aspx.5f2dec3.mu4zwoaq.0.cs:line 0

 

   at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()

 

   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

 

I've tried to rebuild the source and attach the debug dlls but it's not getting picked up at all - any ideas or suggestions or is this a known bug?

 

Simon