Hi,

We're using Umbraco v6.2.1 with Umbraco Courier 2.7.8.9.v6. If we browse to Umbraco -> Courier -> Deploy then we receive the following error:

[KeyNotFoundException: The given key was not present in the dictionary.]

System.Collections.Generic.Dictionary2.get_Item(TKey key) +12264833 Umbraco.Courier.Core.PersistenceManager.get_Default() +76 Umbraco.Courier.Core.ItemProvider.get_DatabasePersistence() +18 Umbraco.Courier.ItemProviders.DataTypeProvider.AvailableSystemItems() +8 Umbraco.Courier.UI.Pages.SimpleRevisionDeploy.<Page_Load>b__0(ItemProvider p) +19 System.Linq.WhereListIterator1.MoveNext() +73 System.Web.UI.WebControls.ListControl.PerformDataBinding(IEnumerable dataSource) +276 System.Web.UI.WebControls.ListControl.OnDataBinding(EventArgs e) +290 System.Web.UI.WebControls.ListControl.PerformSelect() +37 System.Web.UI.WebControls.BaseDataBoundControl.DataBind() +74 Umbraco.Courier.UI.Pages.SimpleRevisionDeploy.Page_Load(Object sender, EventArgs e) +199 System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +51 System.Web.UI.Control.OnLoad(EventArgs e) +95 System.Web.UI.Control.LoadRecursive() +59 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +678

After some decompiling and debugging Courier.UI.dll we found out that the error occurs when binding the data to the dropdownlist.

SimpleRevisionDeploy.cs -> Line: 41, this.ddl_types.DataBind();

protected void Page_Load(object sender, EventArgs e)
    {
        if (!this.Page.get_IsPostBack())
        {
            IEnumerable<ItemProvider> enumerable = from p in ItemProviderCollection.Instance.GetProviders()
                                                    where (bool)((p.AvailableSystemItems().get_Count() > 0) && !CourierSecurity.ValidateNegativeSetting(CourierSecurity.BuildKey(p.Id, UserProviderSettings.DenyUsage)))
                                                    select p;

            this.ddl_types.set_DataSource(enumerable);
            this.ddl_types.set_DataTextField("Name");
            this.ddl_types.set_DataValueField("Id");
            this.ddl_types.DataBind();
            this.ddl_types.Items.Insert(0, new ListItem("Select item type", string.Empty));
        }
    }

Unfortunately it's not possible to Upgrade to Umbraco 7 due to time shortage.

Kind Regards, Frank