Error creating EF Model with wizard

I'm trying to generate an EntityFramework Model on an SQL Server 2008 R2 with the Wizard. The connection to the database server can be established and all databases are shown...

This is my SD-Version:

SharpDevelop Version : 4.4.1.9729-7196a277
.NET Version         : 4.0.30319.18063
OS Version           : Microsoft Windows NT 6.1.7601 Service Pack 1
Current culture      : German (Germany) (de-DE)
Current UI language  : en

When clicking "Finish" in the wizard I get the following unhandled exception:

System.NullReferenceException: Object reference not set to an instance of an object.
   at ICSharpCode.Data.EDMDesigner.Core.IO.EDMXIO.WriteXDocument(XDocument ssdlDocument, XDocument csdlDocument, XDocument mslDocument) in c:\Users\123\Downloads\SharpDevelop_4.4.1.9729_Source\src\AddIns\DisplayBindings\Data\ICSharpCode.Data.EDMDesigner.Core\IO\EDMXIO.cs:line 155
   at ICSharpCode.Data.EDMDesigner.Core.ObjectModelConverters.EDMConverter.CreateEDMXFromIDatabase(IDatabase database, String modelNamespace, String objectContextNamespace, String objectContextName) in c:\Users\123\Downloads\SharpDevelop_4.4.1.9729_Source\src\AddIns\DisplayBindings\Data\ICSharpCode.Data.EDMDesigner.Core\ObjectModelConverters\EDMConverter.cs:line 76
   at ICSharpCode.Data.EDMDesigner.Core.Windows.EDMWizard.EDMWizardWindow.OnFinished() in c:\Users\123\Downloads\SharpDevelop_4.4.1.9729_Source\src\AddIns\DisplayBindings\Data\ICSharpCode.Data.EDMDesigner.Core\Windows\EDMWizard\EDMWizardWindow.cs:line 160
   at ICSharpCode.Data.Core.UI.Windows.WizardWindowInnards.btnFinish_Click(Object sender, RoutedEventArgs e) in c:\Users\123\Downloads\SharpDevelop_4.4.1.9729_Source\src\AddIns\DisplayBindings\Data\ICSharpCode.Data.Core.UI\Windows\WizardWindowInnards.xaml.cs:line 215

What am I doing wrong?