Fatal error: Cannot redeclare get_page_by_title() (previously declared in /autoinstalator/wordpress1/wp-includes/post.php:5778) in /autoinstalator/wordpress1/wp-includes/deprecated.php on line 4557

Fatal error: Uncaught Error: Call to a member function set() on null in /autoinstalator/wordpress1/wp-includes/l10n.php:786 Stack trace: #0 /autoinstalator/wordpress1/wp-includes/l10n.php(874): load_textdomain('default', '/autoinstalator...', 'pl_PL') #1 /autoinstalator/wordpress1/wp-includes/class-wp-fatal-error-handler.php(47): load_default_textdomain() #2 [internal function]: WP_Fatal_Error_Handler->handle() #3 {main} thrown in /autoinstalator/wordpress1/wp-includes/l10n.php on line 786