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Hi, Today I got this error in all my domains:
Then I tried to change index.php to see if there is any error in my wordpress or not. But I gor this:
Then, I tried to check disk quota from directadmin cpanel and it returns:
and there is no way I can delete some data and go back to normal state. in Domain Statistics, all domains have 0B disk usages. It's the first time I am getting this error. Can anyone please help???

This isn’t really a WordPress issue. You’ve run out of space in your hosting. Use the file manager in cPanel to delete files or speak to your host.