Not able to open MonoDevelop v 2.4.2

When I try to open MonoDevelop this error appears in the console log

com.apple.launchd.peruser.501[249] ([0x0-0x13013].com.ximian.monodevelop[308]) Exited with exit code: 255

How can I fix the problem?

EDIT: Snow Leopard 10.6.8, MonoDevelop 2.4.2 and Mono 2.10.5.

UPDATE: This is the error if I try to run MonoDevelop from shell

LSOpenURLsWithRole() failed with error -10810 for the file /Applications/MonoDevelop.app.

UPDATE 2: I've found the crash reporter for mono

FATAL ERROR [2011-09-03 15:06:25Z]: MonoDevelop failed to start. Some of the assemblies required to run MonoDevelop (for example gtk-sharp, gnome-sharp or gtkhtml-sharp) may not be properly installed in the GAC.
System.DllNotFoundException: /Library/Frameworks/Mono.framework/Versions/2.10.5/lib/libgtk-quartz-2.0.0.dylib
  at (wrapper managed-to-native) Gtk.Application:gtk_init (int&,intptr&)
  at Gtk.Application.do_init (System.String progname, System.String[]& args, Boolean check) [0x00000] in <filename unknown>:0 
  at Gtk.Application.Init (System.String progname, System.String[]& args) [0x00000] in <filename unknown>:0 
  at MonoDevelop.Ide.IdeStartup.Run (System.String[] args) [0x00000] in <filename unknown>:0 
  at MonoDevelop.Startup.MonoDevelopMain.Main (System.String[] args) [0x00000] in <filename unknown>:0

Any help?

Solution

For those interested in:

Uninstall Mono with this script uninstall script. You have to save the script in a file with extension .sh
Save the file in the desktop as uninstallMonoFr.sh (for example)
Open a terminal window: cd Desktop, sudo ./uninstallMonoFr.sh, insert your pwd
Download mono framework 2.10.4 (this version works for me)
Install again

I don't know if the problem is due to 2.10.5 version of mono framework. 2.10.4 works well.

UPDATE Seems that Mono 2.10.5 still presenting a package bug. MonoDevelop can't open with this version. Mono 2.10.4 works.

UPDATE 2 I've just installed 2.10.6 and it works. MonoDevelop now opens correctly.