#1 Exception when updating model from a VS 2010 solution

[Robajz]

Key cannot be null.
Parameter name: key.

************** Exception Text **************
System.ArgumentNullException: Key cannot be null.
Parameter name: key
at System.Collections.Hashtable.get_Item(Object key)
at UMLDes.Model.MSIL.ModelBuilder.Inheritances(UmlProject proj, Hashtable dllprojs, ArrayList errors)
at UMLDes.Model.CSharp.ModelBuilder.BuildMSILInheritances()
at UMLDes.Model.CSharp.ModelBuilder.Update()
at UMLDes.Model.CSharp.ModelBuilder.UpdateModel(UmlModel model, ArrayList& errors, StatusNotifier sn)
at UMLDes.UmlDesignerSolution.Refresh()
at UMLDes.MainWnd.RefreshProject(Object sender, EventArgs e)
at System.Windows.Forms.MenuItem.OnClick(EventArgs e)
at System.Windows.Forms.MenuItem.ShortcutClick()
at System.Windows.Forms.Menu.ProcessCmdKey(Message& msg, Keys keyData)
at System.Windows.Forms.Form.ProcessCmdKey(Message& msg, Keys keyData)
at System.Windows.Forms.Control.ProcessCmdKey(Message& msg, Keys keyData)
at System.Windows.Forms.Control.ProcessCmdKey(Message& msg, Keys keyData)
at System.Windows.Forms.Control.PreProcessMessage(Message& msg)
at System.Windows.Forms.Control.PreProcessControlMessageInternal(Control target, Message& msg)
at System.Windows.Forms.Application.ThreadContext.PreTranslateMessage(MSG& msg)

************** Loaded Assemblies **************
mscorlib
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.4952 (win7RTMGDR.050727-4900)
CodeBase: file:///C:/Windows/Microsoft.NET/Framework/v2.0.50727/mscorlib.dll
----------------------------------------
UmlDes.Gui
Assembly Version: 0.9.1974.30427
Win32 Version: 0.9.1974.30427
CodeBase: file:///C:/Users/r.sevcik/Downloads/uml_designer_1_0_binaries/UmlDes.Gui.exe
----------------------------------------
UMLDes.Controls
Assembly Version: 1.0.1974.30427
Win32 Version: 1.0.1974.30427
CodeBase: file:///C:/Users/r.sevcik/Downloads/uml_designer_1_0_binaries/UMLDes.Controls.DLL
----------------------------------------
System.Windows.Forms
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.4927 (NetFXspW7.050727-4900)
CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Windows.Forms/2.0.0.0__b77a5c561934e089/System.Windows.Forms.dll
----------------------------------------
System
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.4927 (NetFXspW7.050727-4900)
CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System/2.0.0.0__b77a5c561934e089/System.dll
----------------------------------------
System.Drawing
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.4927 (NetFXspW7.050727-4900)
CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Drawing/2.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll
----------------------------------------
UMLDes.View
Assembly Version: 1.0.1974.30427
Win32 Version: 1.0.1974.30427
CodeBase: file:///C:/Users/r.sevcik/Downloads/uml_designer_1_0_binaries/UMLDes.View.DLL
----------------------------------------
UMLDes.Model
Assembly Version: 1.0.1974.30426
Win32 Version: 1.0.1974.30426
CodeBase: file:///C:/Users/r.sevcik/Downloads/uml_designer_1_0_binaries/UMLDes.Model.DLL
----------------------------------------
UMLDes.StaticView
Assembly Version: 1.0.1974.30427
Win32 Version: 1.0.1974.30427
CodeBase: file:///C:/Users/r.sevcik/Downloads/uml_designer_1_0_binaries/UMLDes.StaticView.DLL
----------------------------------------
UMLDes.Model.CSharp
Assembly Version: 1.0.1974.30426
Win32 Version: 1.0.1974.30426
CodeBase: file:///C:/Users/r.sevcik/Downloads/uml_designer_1_0_binaries/UMLDes.Model.CSharp.DLL
----------------------------------------
System.Xml
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.4927 (NetFXspW7.050727-4900)
CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Xml/2.0.0.0__b77a5c561934e089/System.Xml.dll
----------------------------------------