I keep getting the "Failed to verify document: Object reference not set to an instance of an object" error when using a termbase that used to work smoothly with Trados Studio 2019 + Windows 8.

I have updated my OS and I cannot use the same termbase any more (still using Trados Studio 2019, but now with Windows 10). I have read similar messages here and I have already tried reorganizing the TB, updating Windows, updating drivers, etc., to no avail.

I am including the error message here, in case anyone can help me understand what the issue really is. 

I must say that the Verify features works just fine if I do not check any of the options I would to enable (i.e., check for forbidden terms in target and check if preferred terms have not been used).

Fullscreen sdlerror-2021329-19h48m43s.sdlerror.xml Download

<SDLErrorDetails time="29/3/2021 19:48:51">
  <ErrorMessage>Error al verificar el documento: Referencia a objeto no establecida como instancia de un objeto.</ErrorMessage>
  <Exception>
    <Type>System.NullReferenceException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</Type>
    <HelpLink />
    <Source>Sdl.Verification.TermVerifier</Source>
    <HResult>-2147467261</HResult>
    <StackTrace><![CDATA[   en Sdl.Verification.TermVerifier.TermVerifierProcessing.CheckForbiddenTerms(ISegment target)
   en Sdl.Verification.TermVerifier.TermVerifierProcessing.Verify(ISegment Source, ISegment Target, Boolean sourceHasRevisions, Boolean targetHasRevisions)
   en Sdl.Verification.TermVerifier.TermVerifierMain.ProcessParagraphUnit(IParagraphUnit paragraphUnit)
   en Sdl.FileTypeSupport.Framework.Core.Utilities.BilingualApi.BilingualContentHandlerAdapter.ProcessParagraphUnit(IParagraphUnit paragraphUnit)
   en Sdl.FileTypeSupport.Framework.Core.Utilities.BilingualApi.BilingualContentHandlerAdapter.ProcessParagraphUnit(IParagraphUnit paragraphUnit)
   en Sdl.FileTypeSupport.Framework.Core.Utilities.BilingualApi.BilingualContentHandlerAdapter.ProcessParagraphUnit(IParagraphUnit paragraphUnit)
   en Sdl.FileTypeSupport.Framework.Integration.AbstractBilingualProcessorContainer.ProcessParagraphUnit(IParagraphUnit paragraphUnit)
   en Sdl.FileTypeSupport.Framework.BilingualApi.AbstractBilingualContentProcessor.ProcessParagraphUnit(IParagraphUnit paragraphUnit)
   en Sdl.FileTypeSupport.Framework.Integration.LocationMarkerLocator.ProcessParagraphUnit(IParagraphUnit paragraphUnit)
   en Sdl.FileTypeSupport.Framework.Integration.AbstractBilingualProcessorContainer.ProcessParagraphUnit(IParagraphUnit paragraphUnit)
   en Sdl.FileTypeSupport.Framework.Integration.FileExtractor.ProcessParagraphUnit(IParagraphUnit paragraphUnit)
   en Sdl.FileTypeSupport.Bilingual.Tmfc.TmfcReaderImpl.vv_Visit(TmfcReaderImpl* , FrameworkParagraphContainerField* field)
   en FrameworkParagraphContainerField.vv_AcceptFrameworkVisitor(FrameworkParagraphContainerField* , FrameworkFieldVisitor* visitor)
   en Sdl.FileTypeSupport.Bilingual.Tmfc.TmfcReaderImpl.vv_VisitStartEndField(TmfcReaderImpl* , StartEndField* startEnd)
   en Sdl.FileTypeSupport.Bilingual.Tmfc.TmfcReaderImpl.b_VisitNext(TmfcReaderImpl* )
   en Sdl.FileTypeSupport.Bilingual.Tmfc.TmfcReader.ParseNext()
   en Sdl.FileTypeSupport.Framework.Integration.FileExtractor.ParseNext()
   en Sdl.FileTypeSupport.Framework.Integration.MultiFileConverter.ParseNext()
   en Sdl.FileTypeSupport.Framework.Integration.MultiFileConverter.Parse()
   en Sdl.TranslationStudio.Editor.Verification.VerifyDocumentJobRequest.PerformBilingualVerification()
   en Sdl.TranslationStudio.Editor.Verification.VerifyDocumentJobRequest.Execute(IJobExecutionContext context)
   en Sdl.Desktop.Platform.Implementation.Services.Job.<_worker_DoWork>b__47_0()
   en Sdl.Desktop.Logger.Log.Resources(Object message, Action action)
   en Sdl.Desktop.Platform.Implementation.Services.Job._worker_DoWork(Object sender, DoWorkEventArgs e)
   en System.ComponentModel.BackgroundWorker.OnDoWork(DoWorkEventArgs e)
   en System.ComponentModel.BackgroundWorker.WorkerThreadStart(Object argument)]]></StackTrace>
  </Exception>
  <Environment>
    <ProductName>SDL Trados Studio</ProductName>
    <ProductVersion>15.0.0.0</ProductVersion>
    <EntryAssemblyFileVersion>15.2.8.3007</EntryAssemblyFileVersion>
    <OperatingSystem>Microsoft Windows 10 Home</OperatingSystem>
    <ServicePack>NULL</ServicePack>
    <OperatingSystemLanguage>3082</OperatingSystemLanguage>
    <CodePage>1252</CodePage>
    <LoggedOnUser>DESKTOP-B0RVTV2\Yani</LoggedOnUser>
    <DotNetFrameWork>4.0.30319.42000</DotNetFrameWork>
    <ComputerName>DESKTOP-B0RVTV2</ComputerName>
    <ConnectedToNetwork>True</ConnectedToNetwork>
    <PhysicalMemory>20719680 MB</PhysicalMemory>
  </Environment>
</SDLErrorDetails>