Sophos Free Encryption Pop Up Message !

Hi! Friends,
I have a problem with my laptop and the Sophos software. There are many files but their extensions are $$$ . These file's sizes are greater than 1GB and I have to delete them from the temp directory and when I went to the temp and selected all of these files and clicked right-click, the following error message appeared to me:

I used the Sophos Antivirus for Windows. I don’t know what is suitable to solve the problem and stop the error message which appears to me. I searched but I found nothing on the other forums. Is there anyone who can solve this problem?
Thanks.
