I am trying to convert an old termbase. But when I start the process, MT convert delivers an error and nothing can be done.

This occurs even before I can chose anything.

See the end of this message for details on invoking
just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************
System.ArgumentException: An entry with the same key already exists.
   at System.Collections.Specialized.ListDictionary.Add(Object key, Object value)
   at Sdl.MultiTerm.Convert.Plugins.Mt5.Gui.HeaderPluginPage.FillLanguageCombo(ComboBox localeCombo)
   at Sdl.MultiTerm.Convert.Plugins.Mt5.Gui.HeaderPluginPage.Init()
   at Sdl.MultiTerm.Convert.Wizard.WizardController.InitPage(WizardPage page)
   at Sdl.MultiTerm.Convert.Wizard.ConversionWizard.InitPage(WizardPage page)
   at Sdl.MultiTerm.Convert.Wizard.WizardController.InsertPages(WizardPageCollection pages, WizardPage beforePage)
   at Sdl.MultiTerm.Convert.Wizard.ConversionWizard.InsertPluginPages(WizardPageCollection pages)
   at Sdl.MultiTerm.Convert.Wizard.PluginsPage.OnNext()
   at Sdl.MultiTerm.Convert.Wizard.WizardController.nextButton_Click(Object sender, EventArgs e)
   at System.Windows.Forms.Control.OnClick(EventArgs e)
   at System.Windows.Forms.Button.OnClick(EventArgs e)
   at System.Windows.Forms.Button.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)


************** Loaded Assemblies **************
mscorlib
    Assembly Version: 4.0.0.0
    Win32 Version: 4.6.1080.0 built by: NETFXREL3STAGE
    CodeBase: file:///C:/Windows/Microsoft.NET/Framework/v4.0.30319/mscorlib.dll
----------------------------------------
MultiTerm Convert
    Assembly Version: 12.0.0.0
    Win32 Version: 12.2.1629.0
    CodeBase: file:///C:/Program%20Files%20(x86)/SDL/SDL%20MultiTerm/MultiTerm12/MultiTerm%20Convert.exe
----------------------------------------
System.Windows.Forms
    Assembly Version: 4.0.0.0
    Win32 Version: 4.6.1038.0 built by: NETFXREL2
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Windows.Forms/v4.0_4.0.0.0__b77a5c561934e089/System.Windows.Forms.dll
----------------------------------------
System
    Assembly Version: 4.0.0.0
    Win32 Version: 4.6.1081.0 built by: NETFXREL3STAGE
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System/v4.0_4.0.0.0__b77a5c561934e089/System.dll
----------------------------------------
System.Drawing
    Assembly Version: 4.0.0.0
    Win32 Version: 4.6.1078.0 built by: NETFXREL3STAGE
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Drawing/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll
----------------------------------------
Sdl.MultiTerm.Convert.Plugins
    Assembly Version: 12.0.0.0
    Win32 Version: 12.2.1629.0
    CodeBase: file:///C:/Program%20Files%20(x86)/SDL/SDL%20MultiTerm/MultiTerm12/Sdl.MultiTerm.Convert.Plugins.DLL
----------------------------------------
Sdl.MultiTerm.Convert.Api
    Assembly Version: 12.0.0.0
    Win32 Version: 12.2.1629.0
    CodeBase: file:///C:/Program%20Files%20(x86)/SDL/SDL%20MultiTerm/MultiTerm12/Sdl.MultiTerm.Convert.Api.DLL
----------------------------------------
Sdl.MultiTerm.Convert.Wizard
    Assembly Version: 12.0.0.0
    Win32 Version: 12.2.1629.0
    CodeBase: file:///C:/Program%20Files%20(x86)/SDL/SDL%20MultiTerm/MultiTerm12/Sdl.MultiTerm.Convert.Wizard.DLL
----------------------------------------
Sdl.MultiTerm.Client.HtmlHelpAccess
    Assembly Version: 12.0.0.0
    Win32 Version: 12.2.1629.0
    CodeBase: file:///C:/Program%20Files%20(x86)/SDL/SDL%20MultiTerm/MultiTerm12/Plugins/Sdl.MultiTerm.Client.HtmlHelpAccess.dll
----------------------------------------
Sdl.MultiTerm.Convert.Builders
    Assembly Version: 12.0.0.0
    Win32 Version: 12.2.1629.0
    CodeBase: file:///C:/Program%20Files%20(x86)/SDL/SDL%20MultiTerm/MultiTerm12/Plugins/Sdl.MultiTerm.Convert.Builders.dll
----------------------------------------
Sdl.MultiTerm.Convert.Plugins.Mt5
    Assembly Version: 12.0.0.0
    Win32 Version: 12.2.1629.0
    CodeBase: file:///C:/Program%20Files%20(x86)/SDL/SDL%20MultiTerm/MultiTerm12/Plugins/Sdl.MultiTerm.Convert.Plugins.Mt5.dll
----------------------------------------
System.Xml
    Assembly Version: 4.0.0.0
    Win32 Version: 4.6.1064.2 built by: NETFXREL3STAGE
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Xml/v4.0_4.0.0.0__b77a5c561934e089/System.Xml.dll
----------------------------------------
Sdl.MultiTerm.Convert.Utility
    Assembly Version: 12.0.0.0
    Win32 Version: 12.2.1629.0
    CodeBase: file:///C:/Program%20Files%20(x86)/SDL/SDL%20MultiTerm/MultiTerm12/Sdl.MultiTerm.Convert.Utility.DLL
----------------------------------------
Sdl.MultiTerm.Convert.Plugins.Olif
    Assembly Version: 12.0.0.0
    Win32 Version: 12.2.1629.0
    CodeBase: file:///C:/Program%20Files%20(x86)/SDL/SDL%20MultiTerm/MultiTerm12/Plugins/Sdl.MultiTerm.Convert.Plugins.Olif.dll
----------------------------------------
Sdl.MultiTerm.Convert.Plugins.SdlTermbase
    Assembly Version: 12.0.0.0
    Win32 Version: 12.2.1629.0
    CodeBase: file:///C:/Program%20Files%20(x86)/SDL/SDL%20MultiTerm/MultiTerm12/Plugins/Sdl.MultiTerm.Convert.Plugins.SdlTermbase.dll
----------------------------------------
Sdl.MultiTerm.Convert.Plugins.SpreadSheet
    Assembly Version: 12.0.0.0
    Win32 Version: 12.2.1629.0
    CodeBase: file:///C:/Program%20Files%20(x86)/SDL/SDL%20MultiTerm/MultiTerm12/Plugins/Sdl.MultiTerm.Convert.Plugins.SpreadSheet.dll
----------------------------------------
Sdl.MultiTerm.Convert.Plugins.Tbx
    Assembly Version: 12.0.0.0
    Win32 Version: 12.2.1629.0
    CodeBase: file:///C:/Program%20Files%20(x86)/SDL/SDL%20MultiTerm/MultiTerm12/Plugins/Sdl.MultiTerm.Convert.Plugins.Tbx.dll
----------------------------------------
Sdl.MultiTerm.Convert.Utility
    Assembly Version: 12.0.0.0
    Win32 Version: 12.2.1629.0
    CodeBase: file:///C:/Program%20Files%20(x86)/SDL/SDL%20MultiTerm/MultiTerm12/Plugins/Sdl.MultiTerm.Convert.Utility.dll
----------------------------------------
Sdl.MultiTerm.Convert.Wizard
    Assembly Version: 12.0.0.0
    Win32 Version: 12.2.1629.0
    CodeBase: file:///C:/Program%20Files%20(x86)/SDL/SDL%20MultiTerm/MultiTerm12/Plugins/Sdl.MultiTerm.Convert.Wizard.dll
----------------------------------------
Trados.Interop.Excel
    Assembly Version: 1.5.0.0
    Win32 Version: 1.5.0.0
    CodeBase: file:///C:/Windows/assembly/GAC/Trados.Interop.Excel/1.5.0.0__4316ebe69d6f1d49/Trados.Interop.Excel.dll
----------------------------------------
Trados.Interop.Office
    Assembly Version: 2.3.0.0
    Win32 Version: 2.3.0.0
    CodeBase: file:///C:/Windows/assembly/GAC/Trados.Interop.Office/2.3.0.0__4316ebe69d6f1d49/Trados.Interop.Office.dll
----------------------------------------
Sdl.MultiTerm.Client.HtmlHelpAccess
    Assembly Version: 12.0.0.0
    Win32 Version: 12.2.1629.0
    CodeBase: file:///C:/Program%20Files%20(x86)/SDL/SDL%20MultiTerm/MultiTerm12/Sdl.MultiTerm.Client.HtmlHelpAccess.DLL
----------------------------------------
Sdl.Desktop.Platform
    Assembly Version: 4.0.0.0
    Win32 Version: 4.2.2717.0
    CodeBase: file:///C:/Program%20Files%20(x86)/SDL/SDL%20MultiTerm/MultiTerm12/Sdl.Desktop.Platform.DLL
----------------------------------------
Sdl.Desktop.Platform.WinForms
    Assembly Version: 4.0.0.0
    Win32 Version: 4.2.2717.0
    CodeBase: file:///C:/Program%20Files%20(x86)/SDL/SDL%20MultiTerm/MultiTerm12/Sdl.Desktop.Platform.WinForms.DLL
----------------------------------------
Sdl.Core.Settings
    Assembly Version: 1.8.0.0
    Win32 Version: 1.8.2694.1
    CodeBase: file:///C:/Program%20Files%20(x86)/SDL/SDL%20MultiTerm/MultiTerm12/Sdl.Core.Settings.DLL
----------------------------------------
Sdl.Core.PluginFramework
    Assembly Version: 1.8.0.0
    Win32 Version: 1.8.2694.0
    CodeBase: file:///C:/Program%20Files%20(x86)/SDL/SDL%20MultiTerm/MultiTerm12/Sdl.Core.PluginFramework.DLL
----------------------------------------
Infragistics4.Win.UltraWinToolbars.v14.2
    Assembly Version: 14.2.20142.2092
    Win32 Version: 14.2.20142.2092
    CodeBase: file:///C:/Program%20Files%20(x86)/SDL/SDL%20MultiTerm/MultiTerm12/Infragistics4.Win.UltraWinToolbars.v14.2.DLL
----------------------------------------
log4net
    Assembly Version: 1.2.10.0
    Win32 Version: 1.2.10.0
    CodeBase: file:///C:/Program%20Files%20(x86)/SDL/SDL%20MultiTerm/MultiTerm12/log4net.DLL
----------------------------------------
Infragistics4.Shared.v14.2
    Assembly Version: 14.2.20142.2092
    Win32 Version: 14.2.20142.2092
    CodeBase: file:///C:/Program%20Files%20(x86)/SDL/SDL%20MultiTerm/MultiTerm12/Infragistics4.Shared.v14.2.DLL
----------------------------------------
Infragistics4.Win.v14.2
    Assembly Version: 14.2.20142.2092
    Win32 Version: 14.2.20142.2092
    CodeBase: file:///C:/Program%20Files%20(x86)/SDL/SDL%20MultiTerm/MultiTerm12/Infragistics4.Win.v14.2.DLL
----------------------------------------
System.Configuration
    Assembly Version: 4.0.0.0
    Win32 Version: 4.6.1038.0 built by: NETFXREL2
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Configuration/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll
----------------------------------------
System.Core
    Assembly Version: 4.0.0.0
    Win32 Version: 4.6.1038.0 built by: NETFXREL2
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Core/v4.0_4.0.0.0__b77a5c561934e089/System.Core.dll
----------------------------------------
UIAutomationProvider
    Assembly Version: 4.0.0.0
    Win32 Version: 4.6.1038.0 built by: NETFXREL2
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/UIAutomationProvider/v4.0_4.0.0.0__31bf3856ad364e35/UIAutomationProvider.dll
----------------------------------------
Infragistics4.Win.UltraWinStatusBar.v14.2
    Assembly Version: 14.2.20142.2092
    Win32 Version: 14.2.20142.2092
    CodeBase: file:///C:/Program%20Files%20(x86)/SDL/SDL%20MultiTerm/MultiTerm12/Infragistics4.Win.UltraWinStatusBar.v14.2.DLL
----------------------------------------
Infragistics4.Win.Misc.v14.2
    Assembly Version: 14.2.20142.2092
    Win32 Version: 14.2.20142.2092
    CodeBase: file:///C:/Program%20Files%20(x86)/SDL/SDL%20MultiTerm/MultiTerm12/Infragistics4.Win.Misc.v14.2.DLL
----------------------------------------
mscorlib.resources
    Assembly Version: 4.0.0.0
    Win32 Version: 4.6.1038.0 built by: NETFXREL2
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/mscorlib.resources/v4.0_4.0.0.0_de_b77a5c561934e089/mscorlib.resources.dll
----------------------------------------
Sdl.MultiTerm.COM
    Assembly Version: 12.0.0.0
    Win32 Version: 12.2.1629.0
    CodeBase: file:///C:/Program%20Files%20(x86)/Common%20Files/SDL/MultiTerm12/Sdl.MultiTerm.COM.dll
----------------------------------------
Sdl.Desktop.Platform.WinForms.resources
    Assembly Version: 4.0.0.0
    Win32 Version: 4.2.2717.0
    CodeBase: file:///C:/Program%20Files%20(x86)/SDL/SDL%20MultiTerm/MultiTerm12/de/Sdl.Desktop.Platform.WinForms.resources.DLL
----------------------------------------
Sdl.Core.Globalization
    Assembly Version: 1.8.0.0
    Win32 Version: 1.8.2694.1
    CodeBase: file:///C:/Program%20Files%20(x86)/SDL/SDL%20MultiTerm/MultiTerm12/Sdl.Core.Globalization.DLL
----------------------------------------

************** JIT Debugging **************
To enable just-in-time (JIT) debugging, the .config file for this
application or computer (machine.config) must have the
jitDebugging value set in the system.windows.forms section.
The application must also be compiled with debugging
enabled.

For example:

<configuration>
    <system.windows.forms jitDebugging="true" />
</configuration>

When JIT debugging is enabled, any unhandled exception
will be sent to the JIT debugger registered on the computer
rather than be handled by this dialog box.

What shall I do?

MTIA and BR, Jerzy