After installing SDL Trados 2021, something happened  and the following error turn up:

However, 2019 works fine.

"Service 'Sdl.TranslationStudio.AlignmentEditor.IAlignmentEditorService' could not be started."

Although I have reparied and uninstalled/iunstalled the SW multiple time,s the error continues to appear.

Please help!

<SDLErrorDetails time="05/06/2021 09:26:03">
  <ErrorMessage>Service 'Sdl.TranslationStudio.AlignmentEditor.IAlignmentEditorService' could not be started.</ErrorMessage>
  <Exception>
    <Type>Sdl.Desktop.Platform.Services.ServiceStartException, Sdl.Desktop.Platform, Version=16.0.0.0, Culture=neutral, PublicKeyToken=c28cdb26c445c888</Type>
    <HelpLink />
    <Source>Sdl.Desktop.Platform</Source>
    <HResult>-2146233088</HResult>
    <StackTrace><![CDATA[   em Sdl.Desktop.Platform.Implementation.Services.ServiceContext.GetLocalService[T]()
   em Sdl.Desktop.Platform.Implementation.Services.ServiceContext.GetService[T]()
   em Sdl.TranslationStudio.AlignmentEditor.Conditions.CurrentAlignmentCondition.OnServiceContextChanged()
   em Sdl.Desktop.Platform.Extensions.AbstractServiceContextAwareCondition.set_ServiceContext(IServiceContext value)
   em Sdl.Desktop.Platform.Extensions.AbstractConditionInitializer.InitializeCondition(ICondition condition)
   em Sdl.Desktop.Platform.Extensions.ConditionHelper.GetCondition(IExtension extension, ConditionResult conditionResult, IConditionInitializer initializer)
   em Sdl.Desktop.Platform.Implementation.ViewReference..ctor(StudioWindow window, ViewDescriptor descriptor)
   em Sdl.Desktop.Platform.Implementation.StudioWindow.Init(IEventAggregator eventAggregator)
   em Sdl.Desktop.Platform.Implementation.Studio.CreateWindowInternal(Boolean setActive, IEventAggregator eventAggregator)
   em Sdl.Desktop.Platform.Implementation.Studio.Run(ISplashScreen splashScreen, IEventAggregator eventAggregator)
   em Sdl.TranslationStudio.Application.Launcher.RunApplication()]]></StackTrace>
    <InnerException>
      <Type>System.ArgumentException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</Type>
      <ParamName />
      <HelpLink />
      <Source>mscorlib</Source>
      <HResult>-2147024809</HResult>
      <StackTrace><![CDATA[   em System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
   em System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
   em Sdl.FileTypeSupport.Framework.Integration.PocoFilterManager.LoadFileTypeCache()
   em Sdl.FileTypeSupport.Framework.Integration.PocoFilterManager.LoadAllDefaultFileTypeDefinitions()
   em Sdl.FileTypeSupport.Framework.Integration.PocoFilterManager..ctor(Boolean autoLoadFileTypes)
   em Sdl.ProjectApi.Implementation.FileTypeConfiguration.get_StandardFilterManager()
   em Sdl.ProjectApi.Implementation.FileTypeConfiguration.get_FilterManager()
   em Sdl.TranslationStudio.AlignmentEditor.AlignmentEditorService.OnStart()
   em Sdl.Desktop.Platform.Services.AbstractService.Start(IServiceContext context)
   em Sdl.Desktop.Platform.Implementation.Services.ServiceContext.GetLocalService[T]()]]></StackTrace>
    </InnerException>
  </Exception>
  <Environment>
    <ProductName>SDL Trados Studio</ProductName>
    <ProductVersion>Studio16</ProductVersion>
    <EntryAssemblyFileVersion>16.1.3.4096</EntryAssemblyFileVersion>
    <OperatingSystem>Microsoft Windows 10 Pro</OperatingSystem>
    <ServicePack>NULL</ServicePack>
    <OperatingSystemLanguage>1046</OperatingSystemLanguage>
    <CodePage>1252</CodePage>
    <LoggedOnUser>BETTER-DESKTOP\Admin</LoggedOnUser>
    <DotNetFrameWork>4.0.30319.42000</DotNetFrameWork>
    <ComputerName>BETTER-DESKTOP</ComputerName>
    <ConnectedToNetwork>True</ConnectedToNetwork>
    <PhysicalMemory>16648244 MB</PhysicalMemory>
  </Environment>
</SDLErrorDetails>