Fatal error: Uncaught TypeError: Return value of NF_Admin_Metaboxes_Calculations::registerReactMetabox() must be an instance of void, none returned in /var/sites/s/scecsal2020.org/public_html/wp-content/plugins/ninja-forms/includes/Admin/Metaboxes/Calculations.php:37 Stack trace: #0 /var/sites/s/scecsal2020.org/public_html/wp-content/plugins/ninja-forms/includes/Admin/Metaboxes/Calculations.php(7): NF_Admin_Metaboxes_Calculations->registerReactMetabox() #1 /var/sites/s/scecsal2020.org/public_html/wp-content/plugins/ninja-forms/ninja-forms.php(370): NF_Admin_Metaboxes_Calculations->__construct() #2 /var/sites/s/scecsal2020.org/public_html/wp-content/plugins/ninja-forms/ninja-forms.php(1227): Ninja_Forms::instance() #3 /var/sites/s/scecsal2020.org/public_html/wp-content/plugins/ninja-forms/ninja-forms.php(1230): Ninja_Forms() #4 /var/sites/s/scecsal2020.org/public_html/wp-settings.php(428): include_once('/var/sites/s/sc...') #5 /var/sites/s/scecsal2020.org/public_html/wp-config.php(108): require_once('/var/sites/s/sc...') # in /var/sites/s/scecsal2020.org/public_html/wp-content/plugins/ninja-forms/includes/Admin/Metaboxes/Calculations.php on line 37