Logger.DisplayLogFile() Empty file name is not legal

[Nick]

Current Date/Time: 2009-12-29 18:52:14
Exec. Date/Time: 2009-12-29 18:49:11
Build Date: 2009-4-20
OS: Microsoft Windows NT 5.1.2600 Service Pack 3
Language: 简体中文 - 美式键盘
System Uptime: 0 Days 1 Hours 32 Mins 43 Secs
Program Uptime: 0 hours 1 mins 81 secs
PID: 256
Thread Count: 10
Thread Id: 1
Executable: F:\注册表清理\Little Registry Cleaner.exe
Process Name: Little Registry Cleaner
Version: 1.2
CLR Version: 2.0.50727.42

Type #0: System.ArgumentException
Message #0: Empty file name is not legal.
Parameter name: sourceFileName
Source #0: mscorlib
Target Site #0: Void Move(System.String, System.String)
Stack Trace:
  at System.IO.File.Move(String sourceFileName, String destFileName)
  at Little_Registry_Cleaner.Logger.DisplayLogFile()
  at Little_Registry_Cleaner.Main.ScanRegistry()
  at Little_Registry_Cleaner.Main.ScanRegistry(Object sender, EventArgs e)
  at System.Windows.Forms.ToolStripItem.RaiseEvent(Object key, EventArgs e)
  at System.Windows.Forms.ToolStripButton.OnClick(EventArgs e)
  at System.Windows.Forms.ToolStripItem.HandleClick(EventArgs e)
  at System.Windows.Forms.ToolStripItem.HandleMouseUp(MouseEventArgs e)
  at System.Windows.Forms.ToolStripItem.FireEventInteractive(EventArgs e, ToolStripItemEventType met)
  at System.Windows.Forms.ToolStripItem.FireEvent(EventArgs e, ToolStripItemEventType met)
  at System.Windows.Forms.ToolStrip.OnMouseUp(MouseEventArgs mea)
  at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
  at System.Windows.Forms.Control.WndProc(Message& m)
  at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
  at System.Windows.Forms.ToolStrip.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)