Hi Chadjana
i just had the same prob just got it fixed like 10min ago.
go to https://builtbackwards.com/projects/tac/
or get the plugin from wordpress.just search TAC.
Scan the theme you are using.
If it say encrypted code found.
click details.
Look on witch line it is.
ftp the header.php and go to that line and del that code.
Upload the header.php again and there you go fixed
Regards
Ruben