Every new day I have this error : failed to open stream: Permission denied

I have this error

The stream or file "/data/www/" could not be opened in append mode: failed to open stream: Permission denied

-rw-r--r-- 1 root root 30833 Jan 14 09:00 laravel-2021-01-14.log

When I change the directory permission it works BUT after one day I got the same error !

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