Fail at powering up my Mac

Hi,

When I switch on my Mac (10.13.3) Avast! always shows a internal error. It shows a warning message…something about a register file, but I can’t find it for checking the fail.

Do you know what could be wrong?

Best!!

Greetings,
Please what is your version of avast? (click on top right on the avast icon, and select Show program info, important is ProgramVersion).
In older version we used to have an issue with spurious popups about internal error although all was working fine.
Kind regards,
Ondrej Kolacek