So – you migrated some file to a plesk/cpanel server and the ownership is wrong. Here is how to change it.
Plesk
[root@austin httpdocs]# cd /var/www/vhosts/domain.com/httpdocs/ [root@austin httpdocs]# chown -R user:group *
cPanel
[root@austin httpdocs]# cd /home/user/public_html/ [root@austin httpdocs]# chown -R user:group *
Or
Plesk
[root@austin httpdocs]# chown -R user:group /var/www/vhosts/domain.com/httpdocs/*
cPanel
[root@austin httpdocs]# chown -R user:group /home/user/public_html/*