Translation provider threw exception

Dear all,

I use Trados Studio 2015, while analyzing and pre-translating files, Trados gives me this error: "Translation provider threw exception".

This is a full error description.

Any suggestions, please? Many thanks in advance!

<SDLErrorDetails time="11/14/2017 4:49:41 PM">
  <ErrorMessage>TranslationProviderThrewException</ErrorMessage>
  <Exception>
    <Type>Sdl.ProjectApi.ProjectApiException, Sdl.ProjectApi, Version=12.0.0.0, Culture=neutral, PublicKeyToken=c28cdb26c445c888</Type>
    <HelpLink />
    <Source />
    <HResult>-2146233088</HResult>
    <StackTrace><![CDATA[]]></StackTrace>
    <InnerException>
      <Type>Sdl.ProjectApi.ProjectApiException, Sdl.ProjectApi, Version=12.0.0.0, Culture=neutral, PublicKeyToken=c28cdb26c445c888</Type>
      <HelpLink />
      <Source />
      <HResult>-2146233088</HResult>
      <StackTrace><![CDATA[]]></StackTrace>
    </InnerException>
  </Exception>
  <Environment>
    <ProductName>SDL Trados Studio</ProductName>
    <ProductVersion>12.0.0.0</ProductVersion>
    <EntryAssemblyFileVersion>12.3.5281.10</EntryAssemblyFileVersion>
    <OperatingSystem>Microsoft Windows 7 Enterprise N </OperatingSystem>
    <ServicePack>Service Pack 1</ServicePack>
    <OperatingSystemLanguage>1033</OperatingSystemLanguage>
    <CodePage>1252</CodePage>
    <LoggedOnUser>AD\almira.z</LoggedOnUser>
    <DotNetFrameWork>4.0.30319.42000</DotNetFrameWork>
    <ComputerName>PI45184</ComputerName>
    <ConnectedToNetwork>True</ConnectedToNetwork>
    <PhysicalMemory>4054512 MB</PhysicalMemory>
  </Environment>
</SDLErrorDetails>

<?xml