it is not possible to set page into site_builder

file: /web/htdocs/www.arbioperu.org/home/page.php:6
call: site_builder::display(public)

file: /web/htdocs/www.arbioperu.org/home/kernel/_lib/site_builder/site_builder.class.php:389
call: site_builder::display_area(public,)

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Fatal error: Uncaught thrown in /web/htdocs/www.arbioperu.org/home/kernel/_lib/site_builder/site_builder.class.php on line 444