Hi Galatia Shiacola 

Can you please advise when does this message appear, is it when you are trying to generate the target file, or when confirming a segment?

Looking forward for your reply 

Loredana 

This message appears when I am trying to close the file I am translating in order to close Trados Studio. I can save the file and I can save it as a target file.

Hi Galatia Shiacola 

It this error prevents closing trados studio please try with a forced close- CTRL +ALT+DEL  - task manger - identify trados studio in the list of processes and click on end tasks. 

Then reopen trados and see if the same happens.

If the same happens please check if trados studio is added to the exception list of the AV https://gateway.sdl.com/apex/communityknowledge?articleName=000001432 or try with a trados reset -https://gateway.sdl.com/apex/communityknowledge?articleName=000001417 

Best regards, 

Loredana