Analyze.timerUpdateFile_Tick(Object sender, EventArgs e) Value cannot be null

[Nick]

Current Date/Time: 6/30/2010 8:26:16 AM
Exec. Date/Time: 6/30/2010 8:23:13 AM
Build Date: 06/27/2010

OS: Microsoft Windows NT 6.1.7600.0
Language: en-US

System Uptime: 0 Days 1 Hours 44 Mins 30 Secs
Program Uptime: 00:00:13.1352842
PID: 3500
Executable: K:\Portable_Apps\Little_Disk_Cleaner_Portable_Edition_06_28_2010\Little Disk Cleaner.exe
Process Name: System.Diagnostics.Process (Little Disk Cleaner)
Main Module Name: Little Disk Cleaner.exe
Module Count: 76
Thread Count: 6

Thread ID: 1
Is Admin: True
Is Debugged: False

Version: 0.1
CLR Version: 4.0.30128.1

Type #0 System.ArgumentNullException
Message #0: Value cannot be null.
Parameter name: str
ParamName #0: str
TargetSite #0: System.String Copy(System.String)
Source #0: mscorlib

StackTrace:
  at System.String.Copy(String str)
  at Little_Disk_Cleaner.Analyze.timerUpdateFile_Tick(Object sender, EventArgs e)
  at System.Windows.Forms.Timer.OnTick(EventArgs e)
  at System.Windows.Forms.Timer.TimerNativeWindow.WndProc(Message& m)
  at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)