Fatal error: Uncaught TypeError: Return value of NF_Admin_Metaboxes_Calculations::registerReactMetabox() must be an instance of void, none returned in /www/htdocs/w012133c/designwordpress/wp-content/plugins/ninja-forms/includes/Admin/Metaboxes/Calculations.php:37
Stack trace:
#0 /www/htdocs/w012133c/designwordpress/wp-content/plugins/ninja-forms/includes/Admin/Metaboxes/Calculations.php(7): NF_Admin_Metaboxes_Calculations->registerReactMetabox()
#1 /www/htdocs/w012133c/designwordpress/wp-content/plugins/ninja-forms/ninja-forms.php(367): NF_Admin_Metaboxes_Calculations->__construct()
#2 /www/htdocs/w012133c/designwordpress/wp-content/plugins/ninja-forms/ninja-forms.php(1163): Ninja_Forms::instance()
#3 /www/htdocs/w012133c/designwordpress/wp-content/plugins/ninja-forms/ninja-forms.php(1166): Ninja_Forms()
#4 /www/htdocs/w012133c/designwordpress/wp-settings.php(517): include_once('/www/htdocs/w01...')
#5 /www/htdocs/w012133c/designwordpress/wp-config.php(94): require_once('/www/htdocs/w01...')
#6 /www/htdocs/w012133c/design in /www/htdocs/w012133c/designwordpress/wp-content/plugins/ninja-forms/includes/Admin/Metaboxes/Calculations.php on line 37