I dont know what caused the error, probably the error occured due to some null pointer exception.
It occurred when i tried to change some of the settings and save it.
Please find the exception details below.
SharpDevelop Version : 2.2.1.2648
.NET Version : 2.0.50727.42
OS Version : Microsoft Windows NT 5.1.2600 Service Pack 2
Current culture : English (United States) (en-US)
Working Set Memory : 78688kb
GC Heap Memory : 15813kb
Exception thrown:
System.NullReferenceException: Object reference not set to an instance of an object.
at HtmlHelp2.MSHelp2TocControl.NamespaceReloaded(Object sender, EventArgs e)
at System.EventHandler.Invoke(Object sender, EventArgs e)
at HtmlHelp2.Environment.HtmlHelp2Environment.OnNamespaceReloaded(EventArgs e)
at HtmlHelp2.Environment.HtmlHelp2OptionsPanel.StorePanelContents()
at ICSharpCode.SharpDevelop.Gui.AbstractOptionPanel.ReceiveDialogMessage(DialogMessage message)
at ICSharpCode.SharpDevelop.Gui.TreeViewOptions.AcceptEvent(Object sender, EventArgs e)
at System.Windows.Forms.Control.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ButtonBase.WndProc(Message& m)
at System.Windows.Forms.Button.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)