1; System thrown Error:Object reference not set to an instance of an object.

---Application Information----
AppTitle: Akshara Indic Script Generator
Build: 0.0.0.9
Environment: Developer Beta
---End of Application Information----

---Usage Information----
Date/Time : 3/13/2008 10:06:03 PM
Friendly Description: 1
---End of Usage Information----

---------Error Trace------------
System.NullReferenceException: Object reference not set to an instance of an object.
at Akshara.WinUI.MainWindow.SetEditMenuItemStates() in C:\Documents and Settings\kiranchands\My Documents\Visual Studio 2005\Projects\Transliteration\TransliterationUI\MainWindow.vb:line 254
at Akshara.WinUI.MainWindow.TabControlCtl_SelectedIndexChanged(Object sender, EventArgs e) in C:\Documents and Settings\kiranchands\My Documents\Visual Studio 2005\Projects\Transliteration\TransliterationUI\MainWindow.vb:line 232
at System.Windows.Forms.TabControl.OnSelectedIndexChanged(EventArgs e)
at System.Windows.Forms.TabControl.WmSelChange()
at System.Windows.Forms.TabControl.set_SelectedIndex(Int32 value)
at System.Windows.Forms.TabControl.ControlCollection.Remove(Control value)
at System.Windows.Forms.TabControl.TabPageCollection.Remove(TabPage value)
at Akshara.WinUI.MainWindow.CloseCurrentFile_Click(Object sender, EventArgs e) in C:\Documents and Settings\kiranchands\My Documents\Visual Studio 2005\Projects\Transliteration\TransliterationUI\MainWindow.vb:line 41

---------End of Error Trace------------