Unable to create termbase. Error: Object reference not set to an instance of an object.

Hi everyone,

I am trying to create a new termbase and right after I click "Finish" I receive the error message: Object reference not set to an instance of an object. As suggested in an older thread related to Multiterm 2015 I tried to rename the Multiterm folder, which unfortunately didn't help.

This is what the error log says...

<SDLErrorDetails time="21.12.2017 17:07:28">
  <ErrorMessage>Der Objektverweis wurde nicht auf eine Objektinstanz festgelegt.</ErrorMessage>
  <Exception>
    <Type>System.NullReferenceException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</Type>
    <HelpLink />
    <Source>Sdl.MultiTerm.Core.Common</Source>
    <HResult>-2147467261</HResult>
    <StackTrace><![CDATA[   bei Sdl.MultiTerm.Core.Common.DataContainers.TermbaseStatus..ctor(ITermbaseInfo info)
   bei Sdl.MultiTerm.Studio.Editor.TermbaseService.CreateTermbase(ITermbaseInfo info)
   bei Sdl.MultiTerm.Studio.Editor.Actions.TermbasesView.CreateTermbaseAction.Execute()
   bei Sdl.Desktop.Platform.Implementation.CommandBars.StaticAction.Execute()
   bei Sdl.Desktop.Platform.Implementation.CommandBars.ActionService.<>c__DisplayClass3.<ExecuteAction>b__2()
   bei Sdl.Desktop.Platform.Implementation.Services.Log.Resources(Object message, Action action)
   bei Sdl.Desktop.Platform.Implementation.CommandBars.ActionService.ExecuteAction(IAction action, ActionOrigin origin, Boolean allowToggle)
   bei Sdl.Desktop.Platform.WinForms.IgCommandBarAction.Execute()
   bei Sdl.Desktop.Platform.WinForms.IgCommandBarAction._lazyButtonTool_ToolClick(Object sender, ToolClickEventArgs e)
   bei Infragistics.Win.UltraWinToolbars.ToolBase.OnToolClick(ToolClickEventArgs e)
   bei Infragistics.Win.UltraWinToolbars.UltraToolbarsManager.OnToolClick(ToolClickEventArgs e)
   bei Infragistics.Win.UltraWinToolbars.UltraToolbarsManager.FireEvent(ToolbarEventIds id, EventArgs e)
   bei Infragistics.Win.UltraWinToolbars.ToolBase.OnToolClick()
   bei Infragistics.Win.UltraWinToolbars.ToolMenuItem.OnClick()
   bei Infragistics.Win.UltraWinToolbars.PopupMenuItemUIElement.DoClickProcessing(MouseEventArgs e)
   bei Infragistics.Win.UltraWinToolbars.PopupMenuItemUIElement.OnMouseUp(MouseEventArgs e)
   bei Infragistics.Win.TextUIElementBase.OnMouseUp(MouseEventArgs e)
   bei Infragistics.Win.ControlUIElementBase.ProcessMouseUpHelper(Object sender, MouseEventArgs e)
   bei Infragistics.Win.ControlUIElementBase.ProcessMouseUp(Object sender, MouseEventArgs e)
   bei Infragistics.Win.Utilities.ProcessEvent(Control control, ProcessEvent eventToProcess, EventArgs e)
   bei Infragistics.Win.UltraWinToolbars.UltraToolbarsDockArea.OnMouseUp(MouseEventArgs e)
   bei System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   bei System.Windows.Forms.Control.WndProc(Message& m)
   bei System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   bei System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   bei System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)]]></StackTrace>
  </Exception>
  <Environment>
    <ProductName>SDL MultiTerm</ProductName>
    <ProductVersion>MultiTerm14</ProductVersion>
    <EntryAssemblyFileVersion>14.1.2471.5</EntryAssemblyFileVersion>
    <OperatingSystem>Microsoft Windows 10 Pro</OperatingSystem>
    <ServicePack>NULL</ServicePack>
    <OperatingSystemLanguage>1031</OperatingSystemLanguage>
    <CodePage>1252</CodePage>
    <LoggedOnUser>DESKTOP-NDKA3CR\Peter</LoggedOnUser>
    <DotNetFrameWork>4.0.30319.42000</DotNetFrameWork>
    <ComputerName>DESKTOP-NDKA3CR</ComputerName>
    <ConnectedToNetwork>True</ConnectedToNetwork>
    <PhysicalMemory>8078856 MB</PhysicalMemory>
  </Environment>
</SDLErrorDetails>

Any idea what this could cause and even more important, what I could do about it?
Any help is appreciated. Thanks in advance.
Best,
Peter