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  • Aristotelis Pitaridis 84 posts 402 karma points
    Jun 18, 2023 @ 14:50
    Aristotelis Pitaridis

    Error when I create a package using the Umbraco Package RCL Visual Studio Template

    I have a problem when I try to create a package using the Umbraco Package RCL Visual Studio Template. I will try to describe exactly what I do in order to create the package.

    I created two projects. The first is called MyUmbraco using the "Umbraco Project (Umbraco HQ) v11.4.0" template and the second is called MyTools using the "Umbraco Package RCL (Umbraco HQ) v11.4.0" template enabling the "Support pages and views" option. I added a reference of the MyTools project to the MyUmbraco project.

    I define the package manifest using the following code inside the ubmraco package project

    using Umbraco.Cms.Core.Composing;
    using Umbraco.Cms.Core.DependencyInjection;
    using Umbraco.Cms.Core.Manifest;
    namespace MyTools;
    internal class MyToolsManifestFilter : IManifestFilter
        public void Filter(List<PackageManifest> manifests)
            manifests.Add(new PackageManifest
                PackageName = "MyTools"
                // I do not need scripts and css files yet
    public class UmbracoPackage1Composer : IComposer
        public void Compose(IUmbracoBuilder builder)

    Now I use the "A guide to creating a custom tree in Umbraco" from the documentation ( in order to define a tree for my package:

    using Microsoft.AspNetCore.Http;
    using Microsoft.AspNetCore.Mvc;
    using Umbraco.Cms.Core;
    using Umbraco.Cms.Core.Actions;
    using Umbraco.Cms.Core.Events;
    using Umbraco.Cms.Core.Models.Trees;
    using Umbraco.Cms.Core.Services;
    using Umbraco.Cms.Core.Trees;
    using Umbraco.Cms.Web.BackOffice.Trees;
    using Umbraco.Extensions;
    namespace MyTools;
    [Tree("settings", "favouriteThingsAlias", TreeTitle = "Favourite Things Name", TreeGroup = "favouritesGroup", SortOrder = 5)]
    public class FavouriteThingsTreeController : TreeController
        private readonly IMenuItemCollectionFactory _menuItemCollectionFactory;
        public FavouriteThingsTreeController(ILocalizedTextService localizedTextService,
            UmbracoApiControllerTypeCollection umbracoApiControllerTypeCollection,
            IMenuItemCollectionFactory menuItemCollectionFactory,
            IEventAggregator eventAggregator)
            : base(localizedTextService, umbracoApiControllerTypeCollection, eventAggregator)
            _menuItemCollectionFactory = menuItemCollectionFactory ?? throw new ArgumentNullException(nameof(menuItemCollectionFactory));
        protected override ActionResult<TreeNodeCollection> GetTreeNodes(string id, FormCollection queryStrings)
            var nodes = new TreeNodeCollection();
            // check if we're rendering the root node's children
            if (id == Constants.System.Root.ToInvariantString())
                // you can get your custom nodes from anywhere, and they can represent anything...
                Dictionary<int, string> favouriteThings = new Dictionary<int, string>();
                favouriteThings.Add(1, "Raindrops on Roses");
                favouriteThings.Add(2, "Whiskers on Kittens");
                favouriteThings.Add(3, "Skys full of Stars");
                favouriteThings.Add(4, "Warm Woolen Mittens");
                favouriteThings.Add(5, "Cream coloured Unicorns");
                favouriteThings.Add(6, "Schnitzel with Noodles");
                // loop through our favourite things and create a tree item for each one
                foreach (var thing in favouriteThings)
                    // add each node to the tree collection using the base CreateTreeNode method
                    // it has several overloads, using here unique Id of tree item,
                    // -1 is the Id of the parent node to create, eg the root of this tree is -1 by convention
                    // - the querystring collection passed into this route
                    // - the name of the tree node
                    // - css class of icon to display for the node
                    // - and whether the item has child nodes
                    var node = CreateTreeNode(thing.Key.ToString(), "-1", queryStrings, thing.Value, "icon-presentation", false);
            return nodes;
        protected override ActionResult<MenuItemCollection> GetMenuForNode(string id, FormCollection queryStrings)
            // create a Menu Item Collection to return so people can interact with the nodes in your tree
            var menu = _menuItemCollectionFactory.Create();
            if (id == Constants.System.Root.ToInvariantString())
                // root actions, perhaps users can create new items in this tree, or perhaps it's not a content tree, it might be a read only tree, or each node item might represent something entirely different...
                // add your menu item actions or custom ActionMenuItems
                menu.Items.Add(new CreateChildEntity(LocalizedTextService));
                // add refresh menu item (note no dialog)
                menu.Items.Add(new RefreshNode(LocalizedTextService, true));
                // add a delete action to each individual item
                menu.Items.Add<ActionDelete>(LocalizedTextService, true, opensDialog: true);
            return menu;
        protected override ActionResult<TreeNode?> CreateRootNode(FormCollection queryStrings)
            var rootResult = base.CreateRootNode(queryStrings);
            if (!(rootResult.Result is null))
                return rootResult;
            var root = rootResult.Value;
            // set the icon
            root.Icon = "icon-hearts";
            // could be set to false for a custom tree with a single node.
            root.HasChildren = true;
            //url for menu
            root.MenuUrl = null;
            return root;

    When I run my project and visit the settings section I have the following error:

    Error page

    Can someone tell me what is my mistake?


  • Lukaz 44 posts 202 karma points
    Jun 27, 2023 @ 10:19

    Hi @Aristotelis Pitaridis, I'm trying out the RCL package with Umbraco v12-RC, and getting the same error. Did you work it out?

  • Aristotelis Pitaridis 84 posts 402 karma points
    Jun 27, 2023 @ 10:35
    Aristotelis Pitaridis

    Hi @Lukaz, unfortunately I haven't been able to find a way to make it work yet. I'm still looking to see if I can find out what's wrong, but so far I haven't been able to find anything.

    The Umbraco team should have made a basic tutorial on how we can use the Umbraco Package RCL Visual Studio Template.

    If I find a solution I will write it in this Post so other people will be able to use it as well.

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