[Mono-osx] Mono 2.10.5 - MonoDevelop crashes with exit code 255

[mac_flex]

When I 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

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

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

This is the crash reporter log:

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
*
This is my configuration: Snow Leopard 10.6.8, MonoDevelop 2.6, Mono 2.10.5
and MT 4.2*

Any suggestions? Thank you in advance. 

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