Error message: Object reference not set to an instance of an object when Ctrl + enter to save segments

I know this topic is already entered here, but I have read and tried some suggested solutions and none has worked so far. Can you please help me?

Some of the workarounds tried with no success:

https://community.sdl.com/product-groups/translationproductivity/f/studio/15475/error-message-object-reference-not-set-to-an-instance-of-an-object

https://gateway.rws.com/csm?id=kb_article_view&sysparm_article=KB0033571

This is the erro log. Thanks in advance.

<SDLErrorDetails time="21/07/2021 11:08:39">
  <ErrorMessage>Referência de objeto não definida para uma instância de um objeto.</ErrorMessage>
  <Exception>
    <Type>System.NullReferenceException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</Type>
    <HelpLink />
    <Source>Sdl.TranslationStudio.Api</Source>
    <HResult>-2147467261</HResult>
    <StackTrace><![CDATA[   em Sdl.TranslationStudio.Api.Common.SdlxliffXmlDocumentHelper.RemoveUnwantedCommentDefinitions(XDocument childDocument, XmlNamespaceManager nsManager)
   em Sdl.TranslationStudio.Api.Common.SdlxliffXmlDocumentHelper.TransferDocumentInfo(XDocument mergedDocument, XDocument childDocument, XmlNamespaceManager nsManager)
   em Sdl.TranslationStudio.Api.Common.MergedFileChildrenPersister.CreateChildFilesDocuments(XmlNamespaceManager nsManager)
   em Sdl.TranslationStudio.Api.Common.MergedFileChildrenPersister.SaveChildFiles(String outputFile, String[] bilingualFilePaths)
   em Sdl.TranslationStudio.Editor.TranslationEditor.TranslatableDocument.SaveBilingualImpl(String[] bilingualFilePaths, Boolean copy, IJobExecutionContext context, Boolean isAutoSaved)
   em Sdl.TranslationStudio.Editor.TranslationEditor.TranslatableDocument.Save(IJobExecutionContext context)
   em Sdl.TranslationStudio.Api.Editor.AbstractInternalDocument.SaveJobRequest.Execute(IJobExecutionContext context)
   em Sdl.Desktop.Platform.Implementation.Services.Job.<_worker_DoWork>b__46_0()
   em Sdl.Desktop.Platform.Implementation.Services.Log.Resources(Object message, Action action)
   em Sdl.Desktop.Platform.Implementation.Services.Job._worker_DoWork(Object sender, DoWorkEventArgs e)
   em System.ComponentModel.BackgroundWorker.OnDoWork(DoWorkEventArgs e)
   em System.ComponentModel.BackgroundWorker.WorkerThreadStart(Object argument)]]></StackTrace>
  </Exception>
  <Environment>
    <ProductName>SDL Trados Studio</ProductName>
    <ProductVersion>14.0.0.0</ProductVersion>
    <EntryAssemblyFileVersion>14.1.10018.54792</EntryAssemblyFileVersion>
    <OperatingSystem>Microsoft Windows 10 Home Single Language</OperatingSystem>
    <ServicePack>NULL</ServicePack>
    <OperatingSystemLanguage>1046</OperatingSystemLanguage>
    <CodePage>1252</CodePage>
    <LoggedOnUser>DESKTOP-54UG09Q\Senju</LoggedOnUser>
    <DotNetFrameWork>4.0.30319.42000</DotNetFrameWork>
    <ComputerName>DESKTOP-54UG09Q</ComputerName>
    <ConnectedToNetwork>True</ConnectedToNetwork>
    <PhysicalMemory>8281392 MB</PhysicalMemory>
  </Environment>
</SDLErrorDetails>

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