little reader won't open - .:Early Learning Community:.

應用程序出現錯誤，顯示以下信息：

Object reference not set to an instance of an object.

Stack Trace:
at BaseEntities.ManagerBase`1.GetBuilder(EGlobalType globalType)
at BaseEntities.PresetManager.GetUnits()
at BaseEntities.ManagerBase`1.LoadUnits()
at BaseEntities.ManagerBase`1..ctor()
at BaseEntities.PresetManager.get_Instance()
at BaseEntities.PresetManager.get_AllItems()
at ReaderEntities.FolderHelper.GetContent(EFolderContent content)
at #=q$GUXwP1Bb2$5j3OgFRy5xeDpitAIDdGN8Lrb$XUTftbDu28az0pPSU4PCsn8WT0U.#=qv2gzzKL14zcQQdd8aS3NWw==(EFolderContent #=qh$eWmnXm$IoJOJB51UBCVA==)
at #=qceUp5bEuS5wK9W_nOC_SL$ur8hKEBTTv5Wgxno9$EGBl0lqnJtQ8EooD9w8KzbUW.#=qorpCVS4uZfE4GZFXf0m_fQ==()
at #=qceUp5bEuS5wK9W_nOC_SL$ur8hKEBTTv5Wgxno9$EGBl0lqnJtQ8EooD9w8KzbUW.#=qOpE06YhUZvuWBToFNHO8Z9h_zEFrLkzBjLdvDBHpirw=()
at #=qfP5gdhNPyeSl$04ON4aowzPOubRUQIejRvcdoOY3U_BjBQGHtVhP_PHByPGJFztw.#=q7_67yifGgqFk9li55FyRUg==()
at #=qfP5gdhNPyeSl$04ON4aowzPOubRUQIejRvcdoOY3U_BjBQGHtVhP_PHByPGJFztw.#=qDQ$tNt26$UQVTaWpBQAivA==(Boolean #=qCsBTZRmkz6J2JiMnhv895w==)
at #=qfP5gdhNPyeSl$04ON4aowzPOubRUQIejRvcdoOY3U_BjBQGHtVhP_PHByPGJFztw.#=qy1lLCyn5Fm5Vb6j8lQ1qqA==()
at #=qE5l$bytbDN5h_CQvIesS5Ssoo5gm3rajaBqcnqQD1Hj6HH$YVZi$2YomeeVTylQL.#=q71qbgoIbDcPYpBRZteIQ_g==(Int32 #=qg3ZLVXnPfV49pIporhDsXg==, #=qfP5gdhNPyeSl$04ON4aowzPOubRUQIejRvcdoOY3U_BjBQGHtVhP_PHByPGJFztw #=qaopGWXEduxjn42toL66a0g==)
at #=qE5l$bytbDN5h_CQvIesS5Ssoo5gm3rajaBqcnqQD1Hj6HH$YVZi$2YomeeVTylQL.#=qIcLACMPRuqFOas9tRco9PrW8BKeptAKlsHrfVf$i05LVlMALpkhg0_Vhw9zWZga8(Object #=qfKxj2LmAgYJsjttQdVnXBQ==, TabSelectedEventArgs #=qLGUyIfJTEUF7KOIWsct3Tg==)
at NewUIControls.AdvancedTabBase.OnSelectedIndexChanging(TabSelectedEventArgs args)
at NewUIControls.AdvancedTabBase.set_SelectedIndex(Int32 value)
at NewUIControls.AdvancedTabBase.SetSelectedTabByName(String name)
at #=qE5l$bytbDN5h_CQvIesS5Ssoo5gm3rajaBqcnqQD1Hj6HH$YVZi$2YomeeVTylQL.#=qqVxBRfFvQEAw_2mMxjqQdw==(ETabs #=qdEdYsOHRMHHk5eQtBEWfcQ==, #=qJnN85Oi4YE0AzTVejfXiUyD1Wrpou1NJExJAY4IdV6m_ZDpPB9anqpBuzwhZYIlo #=q8zLdrlOAoV3zRmoKu1642w==)
at #=qE5l$bytbDN5h_CQvIesS5Ssoo5gm3rajaBqcnqQD1Hj6HH$YVZi$2YomeeVTylQL.#=qug1mSXjljF3GtqSv7xEyng==(Object #=q4QbIaqkknuaGSzXk6EZYuA==, EventArgs #=qGIuMjfYqKTwzpJ_ebsoyoQ==)
at System.EventHandler.Invoke(Object sender, EventArgs e)
at System.Windows.Forms.Form.OnLoad(EventArgs e)
at NewUIControls.AdvancedForm.OnLoad(EventArgs e)
at System.Windows.Forms.Form.OnCreateControl()
at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible)
at System.Windows.Forms.Control.CreateControl()
at System.Windows.Forms.Control.WmShowWindow(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
at System.Windows.Forms.ContainerControl.WndProc(Message& m)
at System.Windows.Forms.Form.WmShowWindow(Message& m)
at System.Windows.Forms.Form.WndProc(Message& m)
at NewUIControls.AdvancedForm.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)

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