Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED))

Question

My error occured at the GroupedItemPage when I am trying to show my messagedialog when my collection count equal zero.

if (VMCount > 0)
            {
                // TODO: Assign a collection of bindable groups to this.DefaultViewModel["Groups"]
                var sampleDataGroups = VMDataSource.GetGroups((String)navigationParameter);
                this.DefaultViewModel["Groups"] = sampleDataGroups;
            }
            else
            {
                var sampleDataGroups = VMDataSource.GetGroups((String)navigationParameter);
                this.DefaultViewModel["Groups"] = sampleDataGroups;

                var message = new MessageDialog("No Virtual Machine is available for your diploma");

                message.Commands.Add(new UICommand("Close", new UICommandInvokedHandler(this.CloseInvokedHandler)));
                message.DefaultCommandIndex = 0;
                await message.ShowAsync();   //Here is the point where the error occured
            }

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Thanks, Smiths