Fatal error: Cannot redeclare sanitize_url() (previously declared in /usr/home/mdsystems/domains/mt-automation.eu/public_html/wp-includes/formatting.php:4619) in /usr/home/mdsystems/domains/mt-automation.eu/public_html/wp-includes/deprecated.php on line 2015

Fatal error: Uncaught Error: Call to a member function set() on null in /usr/home/mdsystems/domains/mt-automation.eu/public_html/wp-includes/l10n.php:806
Stack trace:
#0 /usr/home/mdsystems/domains/mt-automation.eu/public_html/wp-includes/l10n.php(900): load_textdomain('default', '/usr/home/mdsys...', 'pl_PL')
#1 /usr/home/mdsystems/domains/mt-automation.eu/public_html/wp-includes/class-wp-fatal-error-handler.php(47): load_default_textdomain()
#2 [internal function]: WP_Fatal_Error_Handler->handle()
#3 {main}
  thrown in /usr/home/mdsystems/domains/mt-automation.eu/public_html/wp-includes/l10n.php on line 806