I've followed Tim's guide on Umbraco.tv to create a new Section, in Umbraco 6.1.3. Besides the fact that I now have to use the [Tree] Attribute and the [Application]-attribute, I followed his example perfectly.

The custom section appears and my content nodes are being loaded correctly.

I then followed his advice on creating a 'Tasks' class that contains the logic for adding and deleting a new item and hooked it up in the UI.xml.

When I use the 'Create' or the 'Delete' method, I get the following exception:

Value cannot be null.
Parameter name: type

at: System.Activator.CreateInstance

So I guess it's trying to load my custom Tasks-class and fails.

My UI.xml contains the following code:

<nodeType alias="BadgerTree">

<header>Badger</header>

<usercontrol>/create/simple.ascx</usercontrol>

<tasks>

<create assembly="Badger.Core" type="BadgesTasks" />

<delete assembly="Badger.Core" type="BadgesTasks" />

</tasks>

</nodeType>

The reference to the assembly is the name of my DLL file, and the BadgesTasks-class does implement ITaskReturnUrl.
I've also tried fulling qualifying my classname with the correct namespace, to no avail.

This is the code of my BadgerTasks: nothing much really as it just uses a repository to save/delete

 public class BadgesTasks : ITaskReturnUrl

    {

        private BadgeController _repository;

        public BadgesTasks()

        {

            _repository = new BadgeController();

        }

 

        private string _returnUrl;

        public string ReturnUrl

        {

            get

            {

                return _returnUrl;

            }

        }

 

        public string Alias { get; set; }

        public int ParentID { get; set; }

        public int TypeID { get; set; }

 

        public bool Delete()

        {

            return _repository.Delete(ParentID);

        }

 

        public bool Save()

        {

            Badge b = new Badge();

            b.Name = Alias;

 

            b = _repository.Save(b);

 

            _returnUrl = "plugins/editBadge.aspx?id=" + b.Id.ToString();

 

            return true;

        }

 

        private int _userId;

        public int UserId

        {

            set { _userId = value; }

        }

    }

 

Can anyone see what I'm doing wrong or does anyone have any ideas on what I could try?

Thanks a million!