Exception in Gtk# callback delegate
  Note: Applications can use GLib.ExceptionManager.UnhandledException to handle the exception.
System.ArgumentNullException: Argument cannot be null.
Parameter name: input
  at System.Text.RegularExpressions.Regex.Match (System.String input, Int32 startat) [0x00000] in <filename unknown>:0 
  at System.Text.RegularExpressions.Regex.IsMatch (System.String input, Int32 startat) [0x00000] in <filename unknown>:0 
  at System.Text.RegularExpressions.Regex.IsMatch (System.String input) [0x00000] in <filename unknown>:0 
  at System.Text.RegularExpressions.Regex.IsMatch (System.String input, System.String pattern, RegexOptions options) [0x00000] in <filename unknown>:0 
  at System.Text.RegularExpressions.Regex.IsMatch (System.String input, System.String pattern) [0x00000] in <filename unknown>:0 
  at Banshee.Collection.Gui.ColumnCellArtist.Render (Hyena.Data.Gui.CellContext context, StateType state, Double cellWidth, Double cellHeight) [0x0008f] in /home/USERNAME/banshee/src/Core/Banshee.ThickClient/Banshee.Collection.Gui/ColumnCellArtist.cs:167 
  at Hyena.Data.Gui.ColumnCell.Render (Hyena.Data.Gui.CellContext context, Double cellWidth, Double cellHeight) [0x00000] in /home/USERNAME/banshee/src/Hyena/Hyena.Gui/Hyena.Data.Gui/ColumnCell.cs:84 
  at Hyena.Data.Gui.ListView`1[T].PaintCell (System.Object item, Int32 column_index, Int32 row_index, Rectangle area, Boolean opaque, Boolean bold, StateType state, Boolean dragging) [0x00116] in /home/USERNAME/banshee/src/Hyena/Hyena.Gui/Hyena.Data.Gui/ListView/ListView_Rendering.cs:460 
  at Hyena.Data.Gui.ListView`1[T].PaintRow (Int32 row_index, Rectangle area, StateType state) [0x000e3] in /home/USERNAME/banshee/src/Hyena/Hyena.Gui/Hyena.Data.Gui/ListView/ListView_Rendering.cs:424 
  at Hyena.Data.Gui.ListView`1[T].PaintList (Rectangle clip) [0x003d7] in /home/USERNAME/banshee/src/Hyena/Hyena.Gui/Hyena.Data.Gui/ListView/ListView_Rendering.cs:355 
  at Hyena.Data.Gui.ListView`1[T].OnExposeEvent (Gdk.EventExpose evnt) [0x000f0] in /home/USERNAME/banshee/src/Hyena/Hyena.Gui/Hyena.Data.Gui/ListView/ListView_Rendering.cs:165 
  at Gtk.Widget.exposeevent_cb (IntPtr widget, IntPtr evnt) [0x00000] in <filename unknown>:0 
   at GLib.ExceptionManager.RaiseUnhandledException(System.Exception e, Boolean is_terminal)
   at Gtk.Widget.exposeevent_cb(IntPtr widget, IntPtr evnt)
   at Gtk.Application.gtk_main()
   at Gtk.Application.Run()
   at Banshee.Gui.GtkBaseClient.Run() in /home/USERNAME/banshee/src/Core/Banshee.ThickClient/Banshee.Gui/GtkBaseClient.cs:line 205
   at Banshee.Gui.GtkBaseClient.Startup() in /home/USERNAME/banshee/src/Core/Banshee.ThickClient/Banshee.Gui/GtkBaseClient.cs:line 82
   at Hyena.Gui.CleanRoomStartup.Startup(Hyena.Gui.StartupInvocationHandler startup) in /home/USERNAME/banshee/src/Hyena/Hyena.Gui/Hyena.Gui/CleanRoomStartup.cs:line 54
   at Banshee.Gui.GtkBaseClient.Startup() in /home/USERNAME/banshee/src/Core/Banshee.ThickClient/Banshee.Gui/GtkBaseClient.cs:line 77
   at Banshee.Gui.GtkBaseClient.Startup(System.String[] args) in /home/USERNAME/banshee/src/Core/Banshee.ThickClient/Banshee.Gui/GtkBaseClient.cs:line 67
   at Nereid.Client.Main(System.String[] args) in /home/USERNAME/banshee/src/Clients/Nereid/Nereid/Client.cs:line 54
make: *** [run] Error 1
