The error occure for no aparent reason. It happens semetimes when accessing the login page, access a course or just changing page. Sometime the error dosen't occure at all, sometimes it happens every 10 minutes.
I've checked the error logs and it's trying to access some script(xmlrpc.php, wp-login) in the public _html folder, but my website is installed on a subdomain.
It's not a permission problem, i've already checked.
I have a theme installed, moove.
If you got any suggestions, don't hesitate.
thank you, have good day!