Fatal error: Uncaught TypeError: Return value of NPS_Survey\NPS_Survey_Plugin_Loader::autoload() must be an instance of NPS_Survey\void, none returned in /wp-content/plugins/bb-ultimate-addon/lib/nps-survey/nps-survey-plugin-loader.php:60
Stack trace:
#0 [internal function]: NPS_Survey\NPS_Survey_Plugin_Loader->autoload('Nps_Survey')
#1 [internal function]: spl_autoload_call('Nps_Survey')
#2 /wp-content/plugins/bb-ultimate-addon/lib/nps-survey/classes/nps-survey-script.php(9): class_exists('Nps_Survey')
#3 /wp-content/plugins/bb-ultimate-addon/lib/nps-survey/nps-survey-plugin-loader.php(91): require_once('/wp-content/plu...')
#4 /wp-includes/class-wp-hook.php(292): NPS_Survey\NPS_Survey_Plugin_Loader->load_files('')
#5 /wp-includes/class-wp-hook.php(316): WP_Hook->apply_filters(NULL, Array)
#6 /wp-includes/plugin.php(484): WP_Hook->do_action(Array)
#7 /wp-settings.php(582): do_action('wp_loaded')
#8 /wp-config.php(93): require_once('/wp-settings.ph...')
#9 /wp-load.php(37): require_once('/wp-config.php')
#10 /wp-blog-head in /wp-content/plugins/bb-ultimate-addon/lib/nps-survey/nps-survey-plugin-loader.php on line 60