I'm not sure what this is, but it's interrupting my ability to work on my text adventure! Can I get some help interpreting this code? Is there any way I can fix this?

System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary.
at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
at TextAdventures.Quest.EditorControls.WFEditorTree.SetMenuEnabled(String key, Boolean enabled)
at TextAdventures.Quest.Editor.UpdateClipboardButtons()
at TextAdventures.Quest.Editor.ShowEditor(String key)
at TextAdventures.Quest.Editor.ctlTree_SelectionChanged(String key)
at TextAdventures.Quest.EditorControls.WFEditorTree.ChangeSelection(String key)
at TextAdventures.Quest.EditorControls.WFEditorTree.SelectCurrentTreeViewItem()
at TextAdventures.Quest.EditorControls.WFEditorTree.ctlTreeView_AfterSelect(Object sender, TreeViewEventArgs e)
at System.Windows.Forms.TreeView.OnAfterSelect(TreeViewEventArgs e)
at System.Windows.Forms.TreeView.TvnSelected(NMTREEVIEW* nmtv)
at System.Windows.Forms.TreeView.WmNotify(Message& m)
at System.Windows.Forms.TreeView.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

I've seen people reporting that error before. It seems to happen if Quest's "recent documents" list gets corrupted.

Unless you're familiar with the registry editor, I'd suggest uninstalling and reinstalling Quest.