[MonoDevelop] monodevel wont start

[DusteD]

I just downloaded the installer ( 
ftp://www.go-mono.com/archive/1.2.4/linux-installer/6/mono-1.2.4_6-installer.bin 
)
and after installing to /opt/mono-1.2.4/ i tried to run monodevelop with 
this result:

ERROR: Add-in scan operation failed. The Mono runtime may have 
encountered an error while trying to load an assembly.
Checking: /home/dusted/.config/MonoDevelop/addins
Checking: /opt/mono-1.2.4/lib/monodevelop/bin
Checking: /opt/mono-1.2.4/lib/monodevelop/AddIns
Checking: /opt/mono-1.2.4/lib/monodevelop/AddIns/AspNetAddIn
Checking: /opt/mono-1.2.4/lib/monodevelop/AddIns/BackendBindings
Checking: /opt/mono-1.2.4/lib/monodevelop/AddIns/ChangeLogAddIn
Checking: /opt/mono-1.2.4/lib/monodevelop/AddIns/MonoDevelop.Autotools
Checking: /opt/mono-1.2.4/lib/monodevelop/AddIns/MonoDevelop.Deployment
Checking: 
/opt/mono-1.2.4/lib/monodevelop/AddIns/MonoDevelop.DesignerSupport
Checking: /opt/mono-1.2.4/lib/monodevelop/AddIns/MonoDevelop.GtkCore
Checking: /opt/mono-1.2.4/lib/monodevelop/AddIns/MonoDevelop.WebReferences
Checking: /opt/mono-1.2.4/lib/monodevelop/AddIns/MonoDeveloperExtensions
Checking: /opt/mono-1.2.4/lib/monodevelop/AddIns/MonoQuery
Checking: /opt/mono-1.2.4/lib/monodevelop/AddIns/NUnit
Checking: /opt/mono-1.2.4/lib/monodevelop/AddIns/VersionControl
Checking: /opt/mono-1.2.4/lib/monodevelop/AddIns/WelcomePage
Scanning file: 
/opt/mono-1.2.4/lib/monodevelop/bin/FirebirdSql.Data.Firebird.dll
Scanning file: /opt/mono-1.2.4/lib/monodevelop/bin/Mono.Addins.Gui.dll
Scanning file: /opt/mono-1.2.4/lib/monodevelop/bin/Mono.Addins.Setup.dll
Scanning file: /opt/mono-1.2.4/lib/monodevelop/bin/Mono.Addins.dll
Scanning file: /opt/mono-1.2.4/lib/monodevelop/bin/Mono.Cecil.dll
Scanning file: /opt/mono-1.2.4/lib/monodevelop/bin/MonoDevelop.Core.dll
Scanning file: /opt/mono-1.2.4/lib/monodevelop/bin/MonoDevelop.Dock.dll
Scanning file: /opt/mono-1.2.4/lib/monodevelop/bin/MonoDevelop.exe
Scanning file: 
/opt/mono-1.2.4/lib/monodevelop/AddIns/MonoDevelop.Components.dll
Scanning file: 
/opt/mono-1.2.4/lib/monodevelop/AddIns/MonoDevelop.Core.Gui.addin.xml
Could not load some add-in assemblies: Could not load file or assembly 
'gtk-sharp, Version=2.8.0.0, Culture=neutral, 
PublicKeyToken=35e10195dab3c99f' or one of its dependencies.
Scanning file: 
/opt/mono-1.2.4/lib/monodevelop/AddIns/MonoDevelop.Core.Gui.dll
Scanning file: 
/opt/mono-1.2.4/lib/monodevelop/AddIns/MonoDevelop.Core.addin.xml
Scanning file: 
/opt/mono-1.2.4/lib/monodevelop/AddIns/MonoDevelop.Documentation.addin.xml
Scanning file: 
/opt/mono-1.2.4/lib/monodevelop/AddIns/MonoDevelop.Documentation.dll
Scanning file: 
/opt/mono-1.2.4/lib/monodevelop/AddIns/MonoDevelop.Ide.addin.xml
Could not load some add-in assemblies: Could not load file or assembly 
'gtk-sharp, Version=2.8.0.0, Culture=neutral, 
PublicKeyToken=35e10195dab3c99f' or one of its dependencies.
Scanning file: /opt/mono-1.2.4/lib/monodevelop/AddIns/MonoDevelop.Ide.dll
ERROR: Add-in scan operation failed

Unhandled Exception: Mono.Addins.Setup.InstallException: Application not 
found: IDE
 at MonoDevelop.Core.ApplicationService.StartApplication (System.String 
appId, System.String[] parameters) [0x00000]
 at MonoDevelop.Startup.SharpDevelopMain.Main (System.String[] args) 
[0x00000]

Im pretty new to this, so i have no idea where to start..
Can anybody give me a pointer on what may be wrong, or what additional 
info could accommodate a solution.

Best Regards
Jimmy