Fatal error on activation
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I’m trying to install Ninja Forms on a site, and it fails on activation because it triggers a fatal error:
Fatal error: Uncaught TypeError: Return value of NF_Admin_Metaboxes_Calculations::registerReactMetabox() must be an instance of void, none returned in /var/www/html/vptj/wp-content/plugins/ninja-forms/includes/Admin/Metaboxes/Calculations.php:37 Stack trace: #0 /var/www/html/vptj/wp-content/plugins/ninja-forms/includes/Admin/Metaboxes/Calculations.php(7): NF_Admin_Metaboxes_Calculations->registerReactMetabox() #1 /var/www/html/vptj/wp-content/plugins/ninja-forms/ninja-forms.php(386): NF_Admin_Metaboxes_Calculations->__construct() #2 /var/www/html/vptj/wp-content/plugins/ninja-forms/ninja-forms.php(1178): Ninja_Forms::instance() #3 /var/www/html/vptj/wp-content/plugins/ninja-forms/ninja-forms.php(1181): Ninja_Forms() #4 /var/www/html/vptj/wp-admin/includes/plugin.php(2314): include_once('/var/www/html/v...') #5 /var/www/html/vptj/wp-admin/plugins.php(192): plugin_sandbox_scrape('ninja-forms/nin...') #6 {main} thrown in /var/www/html/vptj/wp-content/plugins/ninja-forms/includes/Admin/Metaboxes/Calculations.php on line 37
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