[已解决] I have lots of PHP Warning

Background of the issue:
I've found a lot of this PHP Warnings in my error log:

open_basedir restriction in effect. File(/) is not within the allowed path(s): (/home/mywebiste/) in /home/mywebsite/www/wp-includes/l10n/class-wp-translation-controller.php on line 106

I'm trying to understand the cause of this issue and fix it. I've also found a similar support thread but it seems it ends without a solution: https://wpml.org/forums/topic/multiple-open_baserdir-warnings/

Symptoms:
I've got a lot of this PHP Warnings in my error log:

open_basedir restriction in effect. File(/) is not within the allowed path(s): (/home/mywebiste/) in /home/mywebsite/www/wp-includes/l10n/class-wp-translation-controller.php on line 106

Questions:
How can I remove and/or fix those PHP warnings?