can't import data into translation memory

Hi, 

I have difficult importing txml files into some translation memories. Sometimes, it works fine, others it gives me the error massage shown in the the file attached here. It's the error report. Thanks for your help 

Q.

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<SDLErrorDetails time="11/7/2021 10:37:21 AM">
<ErrorMessage>Import failed. The file could not be processed.</ErrorMessage>
<Exception>
<Type>System.Exception, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</Type>
<HelpLink />
<Source>Sdl.TranslationStudio.TranslationMemoryManager</Source>
<HResult>-2146233088</HResult>
<StackTrace><![CDATA[ at Sdl.TranslationStudio.TranslationMemoryManager.ImportWizard.ImportJobRequest.Execute(IJobExecutionContext context)
at Sdl.Desktop.Platform.Implementation.Services.Job.<_worker_DoWork>b__47_0()
at Sdl.Desktop.Logger.Log.Resources(Object message, Action action)
at Sdl.Desktop.Platform.Implementation.Services.Job._worker_DoWork(Object sender, DoWorkEventArgs e)
at System.ComponentModel.BackgroundWorker.OnDoWork(DoWorkEventArgs e)
at System.ComponentModel.BackgroundWorker.WorkerThreadStart(Object argument)]]></StackTrace>
<InnerException>
<Type>Sdl.LanguagePlatform.Core.LanguagePlatformException, Sdl.LanguagePlatform.Core, Version=1.6.0.0, Culture=neutral, PublicKeyToken=c28cdb26c445c888</Type>
<HelpLink />
<Source>Sdl.LanguagePlatform.TranslationMemoryApi</Source>
<HResult>-2146233088</HResult>
<StackTrace><![CDATA[ at Sdl.LanguagePlatform.TranslationMemoryApi.FileBasedTranslationMemoryLanguageDirection.AddTranslationUnitsMasked(TranslationUnit[] translationUnits, ImportSettings settings, Boolean[] mask)
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