follow up: I managed to get the php error log:
[06-Mar-2019 13:31:56 UTC] PHP Fatal error: Uncaught Error: Class 'es_cls_settings' not found in /var/www/wordpress-mu/wp-content/plugins/icegram-rainmaker/classes/mailers/email_subscribers.php:70
Stack trace:
#0 /var/www/wordpress-mu/wp-includes/class-wp-hook.php(286): Rm_Mailer_Email_Subscribers->email_subscribers_add_subscriber(Array, Array)
#1 /var/www/wordpress-mu/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(NULL, Array)
#2 /var/www/wordpress-mu/wp-includes/plugin.php(465): WP_Hook->do_action(Array)
#3 /var/www/wordpress-mu/wp-content/plugins/icegram-rainmaker/classes/class-icegram-rainmaker.php(436): do_action('rainmaker_post_...', Array, Array)
#4 /var/www/wordpress-mu/wp-includes/class-wp-hook.php(286): Rainmaker->rm_rainmaker_add_lead(Array)
#5 /var/www/wordpress-mu/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters('', Array)
#6 /var/www/wordpress-mu/wp-includes/plugin.php(465): WP_Hook->do_action(Array)
#7 /var/www/wordpress-mu/wp-admin/admin-ajax.php(167): do_action('wp_ajax_rm_rain...')
#8 {main}
thrown in /var/www/wordpress-mu/wp-content/plugins/icegram-rainmaker/classes/mailers/email_subscribers.php on line 70
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This reply was modified 5 years, 8 months ago by liane.