MonoDevelop Not Opening Mac

Basically, I try to open MonoDevelop, and it will show the little bouncing icon like normally. However, it then closes after a brief 5 seconds. (Or less) This is the console:

System.TypeInitializationException: An exception was thrown by the type initializer for Mono.Unix.Native.Stdlib ---> System.DllNotFoundException: /Library/Frameworks/Mono.framework/Versions/2.10.2/lib/libMonoPosixHelper.dylib
  at (wrapper managed-to-native) Mono.Unix.Native.Stdlib:GetDefaultSignal ()
  at Mono.Unix.Native.Stdlib..cctor () [0x00000] in :0 
  --- End of inner exception stack trace ---
  at Mono.Unix.UnixMarshal.AllocHeap (Int64 size) [0x00000] in :0 
  at Mono.Unix.UnixMarshal.StringToHeap (System.String s, Int32 index, Int32 count, System.Text.Encoding encoding) [0x00000] in :0 
  at Mono.Unix.UnixMarshal.StringToHeap (System.String s, System.Text.Encoding encoding) [0x00000] in :0 
  at Mono.Unix.UnixMarshal.StringToHeap (System.String s) [0x00000] in :0 
  at Mono.Unix.Catalog.MarshalStrings (System.String s1, System.IntPtr& p1, System.String s2, System.IntPtr& p2, System.String s3, System.IntPtr& p3) [0x00000] in :0 
  at Mono.Unix.Catalog.Init (System.String package, System.String localedir) [0x00000] in :0 
  at MonoDevelop.Core.GettextCatalog..cctor () [0x0014c] in /BuildAgent/work/f07246b5212f7be4/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Core/Gettext.cs:83 
FATAL ERROR [2013-07-24 21:35:31Z]: MonoDevelop-Unity 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.TypeInitializationException: An exception was thrown by the type initializer for Mono.Unix.Native.Stdlib ---> System.DllNotFoundException: /Library/Frameworks/Mono.framework/Versions/2.10.2/lib/libMonoPosixHelper.dylib
  at (wrapper managed-to-native) Mono.Unix.Native.Stdlib:GetDefaultSignal ()
  at Mono.Unix.Native.Stdlib..cctor () [0x00000] in :0 
  --- End of inner exception stack trace ---
  at Mono.Unix.UnixMarshal.AllocHeap (Int64 size) [0x00000] in :0 
  at Mono.Unix.UnixMarshal.StringToHeap (System.String s, Int32 index, Int32 count, System.Text.Encoding encoding) [0x00000] in :0 
  at Mono.Unix.UnixMarshal.StringToHeap (System.String s, System.Text.Encoding encoding) [0x00000] in :0 
  at Mono.Unix.UnixMarshal.StringToHeap (System.String s) [0x00000] in :0 
  at Mono.Unix.Catalog.MarshalStrings (System.String s1, System.IntPtr& p1, System.String s2, System.IntPtr& p2, System.String s3, System.IntPtr& p3) [0x00000] in :0 
  at Mono.Unix.Catalog.Init (System.String package, System.String localedir) [0x00000] in :0 
  at MonoDevelop.Core.GettextCatalog..cctor () [0x0014c] in /BuildAgent/work/f07246b5212f7be4/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Core/Gettext.cs:83

Thanks for the help.

Hi! I had the same prob, but then i realised something. go to the app store and get TextWrangler - its free! then go into unity and go to Preferences, External Tools, External Script Editors, and find TextWrangler in the Applications folder. its a great replacement for monodevelop. i hope this wrks 4 u.

It’s probably one of the two:

  1. Weird missing DLL
  2. Permissions (at least on mac)