Parse error: Unclosed '(' in /usr/home/netmonster/domains/eko-balinox.pl/public_html/wp-includes/Requests/src/Requests.php on line 526

Fatal error: Uncaught Error: Call to a member function set() on null in /usr/home/netmonster/domains/eko-balinox.pl/public_html/wp-includes/l10n.php:850
Stack trace:
#0 /usr/home/netmonster/domains/eko-balinox.pl/public_html/wp-includes/l10n.php(953): load_textdomain('default', '/usr/home/netmo...', 'pl_PL')
#1 /usr/home/netmonster/domains/eko-balinox.pl/public_html/wp-includes/class-wp-fatal-error-handler.php(49): load_default_textdomain()
#2 [internal function]: WP_Fatal_Error_Handler->handle()
#3 {main}
  thrown in /usr/home/netmonster/domains/eko-balinox.pl/public_html/wp-includes/l10n.php on line 850