@Koma.1
You have posted in the Avast Beta testing section of the forum.
If you are not testing a Beta version of Avast then you would be better posting in the main AV section here:
https://forum.avast.com/index.php?board=2.0From your post, see you have Win10 and Avast Premium. Is it a "Boot Scan" you are finding an error? If so what is the error message?
A screenshot of the error message would be good to aid understanding of your issue. Use the "Attachments and other options" link when posting.