Hi Amr,

It's not an Umbraco Package, you have to install it with Nuget...

So run the command

Install-Package Nibble.Umbraco.UIOMatic

https://www.nuget.org/packages/Nibble.Umbraco.UIOMatic/

From the package manager console in visual studio

Ah ok it is installed, do you have any pocos in place? Mind sharing the poco?

Hi Tim

I Already Have poco and this an example and Left Folder Contain all my pocos

Ok thanks well mind posting the entire stack trace of the error, since from the screenshot I can't get the full details, thanks!

)]}', {"Message":"An error has occurred.","ExceptionMessage":"Object reference not set to an instance of an object.","ExceptionType":"System.NullReferenceException","StackTrace":" at Umbraco.Web.Trees.ApplicationTreeExtensions.TryLoadFromControllerTree(ApplicationTree appTree, String id, FormDataCollection formCollection, HttpControllerContext controllerContext)\r\n at Umbraco.Web.Trees.ApplicationTreeController.

Hmm don't get any wiser from the stracktrace, what I would do since you have a lot of models is to exlude them all and then add them in 1 by 1 (and check on which one the error occurs), if you have 1 with an error then send the poco to me and I'll try to replicate.

Cheers, Tim

@Amr, did you get to the bottom of this one?

is working on a reply...