<br />
<b>Fatal error</b>:  Cannot redeclare block_core_navigation_submenu_build_css_colors() (previously declared in /home/server462349/ftp/wordpress/wpn_bipkozienice/wp-includes/deprecated.php:5309) in <b>/home/server462349/ftp/wordpress/wpn_bipkozienice/wp-includes/blocks/navigation-submenu.php</b> on line <b>17</b><br />
<br />
<b>Fatal error</b>:  Uncaught Error: Call to a member function set() on null in /home/server462349/ftp/wordpress/wpn_bipkozienice/wp-includes/l10n.php:806
Stack trace:
#0 /home/server462349/ftp/wordpress/wpn_bipkozienice/wp-includes/l10n.php(900): load_textdomain('default', '/home/server462...', 'pl_PL')
#1 /home/server462349/ftp/wordpress/wpn_bipkozienice/wp-includes/class-wp-fatal-error-handler.php(47): load_default_textdomain()
#2 [internal function]: WP_Fatal_Error_Handler-&gt;handle()
#3 {main}
  thrown in <b>/home/server462349/ftp/wordpress/wpn_bipkozienice/wp-includes/l10n.php</b> on line <b>806</b><br />