Object reference not set to an instance of an object

I recevied the following error message. Any ideas?

 

<?xml version="1.0"?>
-<SDLErrorDetails time="9/19/2017 7:52:55 AM">
<ErrorMessage>Object reference not set to an instance of an object.</ErrorMessage>
-<Exception>
<Type>System.NullReferenceException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</Type>
<HelpLink/>
<Source>Sdl.TranslationStudio.Editor</Source>
<HResult>-2147467261</HResult>
-<StackTrace>
<![CDATA[ at Sdl.TranslationStudio.Editor.Terminology.TermbaseViewer.MultiTermViewerWinFormsUI.SetMiniEditorItems(ITermbaseInfo termbaseInfo) at Sdl.TranslationStudio.Editor.Terminology.TermbaseViewer.MultiTermViewerWinFormsUI.get_Control() at Sdl.TranslationStudio.Editor.Terminology.TermbaseViewer.TermBaseViewPartX.UpdateTermBaseViewPartControl(ITerminologyProviderViewerWinFormsUI viewerControl)]]>
</StackTrace>
</Exception>
-<Environment>
<ProductName>SDL Trados Studio</ProductName>
<ProductVersion>14.0.0.0</ProductVersion>
<EntryAssemblyFileVersion>14.1.6329.7</EntryAssemblyFileVersion>
<OperatingSystem>Microsoft Windows 10 Pro</OperatingSystem>
<ServicePack>NULL</ServicePack>
<OperatingSystemLanguage>2058</OperatingSystemLanguage>
<CodePage>1252</CodePage>
<LoggedOnUser>PT\carlosdiaz</LoggedOnUser>
<DotNetFrameWork>4.0.30319.42000</DotNetFrameWork>
<ComputerName>PT-14-PC</ComputerName>
<ConnectedToNetwork>True</ConnectedToNetwork>
<PhysicalMemory>8282724 MB</PhysicalMemory>
</Environment>
</SDLErrorDetails>

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