Подробные видеоинструкции Wordpress на тему: "Failed to open stream no such file or directory in wordpress":
How To Fix Wordpress Fatal Error Failed to Open Stream wp-settings.php on line 21
Wordpress: Failed to open stream / no such file or directory (2 Solutions!!)
Solved: Fatal error:require():Failed opening required file | Wordpress
Easy Fix For Jetpack Errors In WordPress Like "failed to open stream" & "No such file"
Warning: Unknown: failed to open stream: No such file or directory in Unknown on line 0 Fatal error.