The lines referenced by the error messages appear to be in the area of CS50.php where it is looking up the configuration file. Make sure the permissions on pset8/includes/config.php are 644 (as in chmod 644 config.php).

The lines referenced by the error messages appear to be in the area of CS50.php where it is looking up the configuration file. Make sure the permissions on pset8/includes/config.php pset8/config.json are 644 (as in chmod 644 config.json).