Also getting the error :

2013-03-19 12:50:25,609 [34] ERROR Umbraco.Core.UmbracoApplicationBase - [Thread 22] An unhandled exception occurred

System.NullReferenceException: The UmbracoContext.Current is null, ProcessRequest cannot proceed unless there is a current UmbracoContext

   at Umbraco.Web.UmbracoModule.ProcessRequest(HttpContextBase httpContext)

   at Umbraco.Web.UmbracoModule.<Init>b__7(Object sender, EventArgs e)

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

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

Can you give steps to reproduce how you are getting this issue? What code is causing this ?

It seems to be happening quite randomly. Any pageload/ajax event on the site in frontend or backend randomly throws this error. It is quite frustrating.

If you have any tips to debug it better, I am more than willing. :)

I'm also getting this error on a new install of Umbraco v6.0.3 (Assembly version: 1.0.4834.18854)

Just when I add any new content.

@Matt, does that happen every time you add new content ? Is it only one type of content or all types?

Hi Shannon,

It's just 2 content types, I'd created them by making copies of an existing doc type. I wanted to do that because they have similar properties.

@Matt ok, but are you getting this error every single time you are creating content of these types ? And what property types do you have assigned to this content type?  I need to have a way to reproduce this error as i cannot locally at the moment.

Hi Shannon

The whole process I went through is:

I installed the Standard Website MVC Starter Kit, I copied the 'Standard' doc type positioned under 'Standard' (named 'Chapter'), removed the panels tab and picker for the panels. In the Structure for 'Standard' I allowed Chapter to be a child.

I hadn't added any additional properties to the Chapter type yet. Every time i tried to add a chapter under a s Standard doc i got the error.

I have now deleted the copied Doc Type and just added it using Create instead of copy and that's ok, but I guess copy should be ok too?

@Matt, ok thanks, i'll create an issue with these details and see if we can replicate.

Also note that the issue @Matt is having is different from the one that @Stephen is having since his appears to be on the front-end. @Matt can you please post the full stack trace you are getting ?

sure:

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: 

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) +14169316
   umbraco.controls.ContentControl.AddControlNew(Property p, TabPage tp, String Caption) +285
   umbraco.controls.ContentControl.LoadPropertyTypes(IContentTypeComposition contentType, TabPage tabPage, Hashtable inTab, Int32 tabId, String tabCaption) +360
   umbraco.controls.ContentControl.CreateChildControls() +804
   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) +1231
   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:4.0.30319.18034

I had a simmilar problem, but the source of my problem was that I've used incorectly the "Mixin" option in uSiteBuilder

Just checking in again. It seems that the problem hasn't 'gone away' (I didn't think it would magically, but you never know).

Is there any way to get better debug information from the system?

[NullReferenceException: The UmbracoContext.Current is null, ProcessRequest cannot proceed unless there is a current UmbracoContext] Umbraco.Web.UmbracoModule.ProcessRequest(HttpContextBase httpContext) +408 Umbraco.Web.UmbracoModule.<Init>b__7(Object sender, EventArgs e) +79 System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +135 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +137

Also, for hte record, we don't use uSiteBuilder. 

The site is an upgrade from 4.7 though.

We ended up disabling log4net and it works now.

... and for the record, Stephen's (and my) server is running New Relic, which may be what's in conflict.

I had the exact same issue and it was resolved by removing duplicate properties from child document types.

In example, my "root" document type had a property called Title and a child to this document type had also implemented that property in a previous version. This was probably allowed since the relations in my database wasn't intact at the moment.

• The benefit from removing the property from the child is that you can edit the pages again
• The downside of removing it is that all data is also removed.

I resolved my same error similarly to Eric above.

When I copied the Doctype it created two Content tabs, one inherited from the parent and one for the new Doctype, removing duplicate fields corrected the error.

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