Parse error: in /web/htdocs/www.cvfm.it/home/wp-includes/post-template.php(2047) : eval()'d code on line 1

Fatal error: Uncaught Error: Call to a member function set() on null in /web/htdocs/www.cvfm.it/home/wp-includes/l10n.php:856 Stack trace: #0 /web/htdocs/www.cvfm.it/home/wp-includes/l10n.php(959): load_textdomain('default', '/web/htdocs/www...', 'it_IT') #1 /web/htdocs/www.cvfm.it/home/wp-includes/class-wp-fatal-error-handler.php(49): load_default_textdomain() #2 [internal function]: WP_Fatal_Error_Handler->handle() #3 {main} thrown in /web/htdocs/www.cvfm.it/home/wp-includes/l10n.php on line 856