Fatal error: Call to undefined method Plugin_Upgrader::init() in /home/salihcan/public_html/wp-admin/includes/class-wp-upgrader.php on line 399

Eklentiyi şimdi kur dediğimde yukarıdaki hatayı alıyorum dosyayı orjinaliyle değiştiiyorum 1 kere güncelliyor ardına tekrar bu hata geliyor fakat dosyada birşeyde değişmiyor halbuki 1. hata bu

2. hata ise

Warning: include_once(../../../wp-config.php): failed to open stream: No such file or directory in /home/salihcan/public_html/wp-content/plugins/wp-codebox/wp-codebox.php on line 27

Warning: include_once(): Failed opening '../../../wp-config.php' for inclusion (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/salihcan/public_html/wp-content/plugins/wp-codebox/wp-codebox.php on line 27

Warning: include_once(../../../wp-settings.php): failed to open stream: No such file or directory in /home/salihcan/public_html/wp-content/plugins/wp-codebox/wp-codebox.php on line 28

Warning: include_once(): Failed opening '../../../wp-settings.php' for inclusion (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/salihcan/public_html/wp-content/plugins/wp-codebox/wp-codebox.php on line 28

Warning: Cannot modify header information - headers already sent by (output started at /home/salihcan/public_html/wp-content/plugins/wp-codebox/wp-codebox.php:27) in /home/salihcan/public_html/wp-admin/includes/export.php on line 39

Warning: Cannot modify header information - headers already sent by (output started at /home/salihcan/public_html/wp-content/plugins/wp-codebox/wp-codebox.php:27) in /home/salihcan/public_html/wp-admin/includes/export.php on line 40

Warning: Cannot modify header information - headers already sent by (output started at /home/salihcan/public_html/wp-content/plugins/wp-codebox/wp-codebox.php:27) in /home/salihcan/public_html/wp-admin/includes/export.php on line 41

dışa aktar dediğimde bilgileri yukarıdaki hatayı alıyorum değiştirdigim halde hatayı alıyorum şuan bunları gördüm yardımlarınız için şimdiden teşekkürler