it is not possible to set page into site_builder

file: /home/vc55gsmm/notaiopaolocoppolabottazzi.it/news.php:7
call: site_builder::display(public)

file: /home/vc55gsmm/notaiopaolocoppolabottazzi.it/kernel/_lib/site_builder/site_builder.class.php:389
call: site_builder::display_area(public,)

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Fatal error: Uncaught thrown in /home/vc55gsmm/notaiopaolocoppolabottazzi.it/kernel/_lib/site_builder/site_builder.class.php on line 444