At our translation agency we are getting error messages during project preparation for one customer in Studio 2021. I have been able to narrow the problem down to the option for getting TU fragment match results when searching a TM: When switched on, I get the errors, when not, I do not. Surprisingly with Studio 2019 we had no problem at all.

It is a project with a server-based TM of about 300,000 units.

The error message itself is very unspecific. Here's the XML code from the project file:

    <AutomaticTask Guid="xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" ComplexTaskTemplateId="Sdl.ProjectApi.AutomaticTask.Prepare.NoProjectTM" PercentComplete="100" Status="Failed" CreatedAt="2021-06-15T09:47:37.614191Z" PredecessorTaskGuid="xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" CreatedBy="XYZ" StartedAt="2021-06-15T09:47:41.449167Z">
      <TaskTemplateIds>
        <TaskTemplateId>Sdl.ProjectApi.AutomaticTasks.PerfectMatch</TaskTemplateId>
        <TaskTemplateId>Sdl.ProjectApi.AutomaticTasks.Translate</TaskTemplateId>
        <TaskTemplateId>Sdl.ProjectApi.AutomaticTasks.Analysis</TaskTemplateId>
      </TaskTemplateIds>
      <Files>
        <TaskFile Guid="xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" Completed="true" ParentTaskFileGuid="xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" LanguageFileGuid="xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" Purpose="WorkFile">
          <Result Guid="xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx">
            <Messages Level="Error" Message="Mindestens ein Fehler ist aufgetreten." Source="Dateien vorübersetzen" />
            <Messages Level="Error" Message="Mindestens ein Fehler ist aufgetreten." Source="Analyse" />
          </Result>
        </TaskFile>
      </Files>
      <OutputFiles />
      <Reports>
        <Report Guid="xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" Name="Vorübersetzungsbericht" Description="Ergebnisse nach der Vorübersetzung." TaskTemplateId="Sdl.ProjectApi.AutomaticTasks.Translate" LanguageDirectionGuid="xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" PhysicalPath="Reports\Dateien vorübersetzen en-GB_de-de.xml" />
        <Report Guid="xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" Name="Analysebericht" Description="Statistik, die die zu erwartende Wiederverwendung früherer Übersetzungen aus den Translation Memorys aufführt." TaskTemplateId="Sdl.ProjectApi.AutomaticTasks.Analysis" LanguageDirectionGuid="xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" PhysicalPath="Reports\Analyse en-GB_de-de.xml" />
      </Reports>
      <Parameters />
      <Result Guid="xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" />
    </AutomaticTask>

Does anyone know why this happens?