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  • Simon Dingley 1431 posts 3332 karma points c-trib
    Mar 06, 2012 @ 11:00
    Simon Dingley
    0

    Umbraco.Forms.Core.Common.ProviderCollection - Null Reference Exception

    Today I am getting an exception when trying to add/edit workflow in Contour however there doesn't seem to be enough detail in the exception to determine what exactly the issue relates to - any ideas?

    [NullReferenceException: Object reference not set to an instance of an object.]
   Umbraco.Forms.Core.Common.ProviderCollection`1.(T , T ) +9
   System.FunctorComparer`1.Compare(T x, T y) +19
   System.Collections.Generic.ArraySortHelper`1.SwapIfGreaterWithItems(T[] keys, IComparer`1 comparer, Int32 a, Int32 b) +91
   System.Collections.Generic.ArraySortHelper`1.QuickSort(T[] keys, Int32 left, Int32 right, IComparer`1 comparer) +58
   System.Collections.Generic.ArraySortHelper`1.Sort(T[] keys, Int32 index, Int32 length, IComparer`1 comparer) +93

[InvalidOperationException: Failed to compare two elements in the array.]
   System.Collections.Generic.ArraySortHelper`1.Sort(T[] keys, Int32 index, Int32 length, IComparer`1 comparer) +330
   System.Array.Sort(T[] array, Int32 index, Int32 length, IComparer`1 comparer) +186
   System.Collections.Generic.List`1.Sort(Comparison`1 comparison) +108
   Umbraco.Forms.Core.Common.ProviderCollection`1.GetProviders() +448
   Umbraco.Forms.UI.Dialogs.editWorkflowDialog.Page_Load(Object sender, EventArgs e) +296
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35
   System.EventHandler.Invoke(Object sender, EventArgs e) +0
   System.Web.UI.Control.OnLoad(EventArgs e) +91
   umbraco.BasePages.BasePage.OnLoad(EventArgs e) +14
   System.Web.UI.Control.LoadRecursive() +74
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2207

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  • Tom Fulton 2030 posts 4996 karma points c-trib
    Mar 06, 2012 @ 15:12
    Tom Fulton
    1

    Hi Simon,

    I have a good guess - do you have a custom WorkflowType that doesn't have a Name property set?  I think it's trying to sort workflow types by name on that screen.

    Ex:

    public class yourClass : WorkflowType
    {
      public yourClass() {
        this.Name = "your workflow name";
        this.Id = new Guid("...");
      }

    HTH,
    Tom

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  • Simon Dingley 1431 posts 3332 karma points c-trib
    Mar 06, 2012 @ 21:26
    Simon Dingley
    0

    Thanks Tom, you hit the nail on the head! I've marked your response as the solution :)

    Cheers, Simon

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