Fatal error: Uncaught mysqli_sql_exception: Can't DROP INDEX `user_id_key`; check that it exists in /webroot/m/y/mydub002/mydubaiprop.com/www/wp-includes/wp-db.php:2030
Stack trace:
#0 /webroot/m/y/mydub002/mydubaiprop.com/www/wp-includes/wp-db.php(2030): mysqli_query()
#1 /webroot/m/y/mydub002/mydubaiprop.com/www/wp-includes/wp-db.php(1918): wpdb->_do_query()
#2 /webroot/m/y/mydub002/mydubaiprop.com/www/wp-content/plugins/newsletter/includes/upgrade.php(170): wpdb->query()
#3 /webroot/m/y/mydub002/mydubaiprop.com/www/wp-content/plugins/newsletter/includes/upgrade.php(546): NewsletterUpgrade->run()
#4 /webroot/m/y/mydub002/mydubaiprop.com/www/wp-content/plugins/newsletter/plugin.php(271): include_once('...')
#5 /webroot/m/y/mydub002/mydubaiprop.com/www/wp-includes/class-wp-hook.php(288): Newsletter->hook_wp_loaded()
#6 /webroot/m/y/mydub002/mydubaiprop.com/www/wp-includes/class-wp-hook.php(312): WP_Hook->apply_filters()
#7 /webroot/m/y/mydub002/mydubaiprop.com/www/wp-includes/plugin.php(478): WP_Hook->do_action()
#8 /webroot/m/y/mydub002/mydubaiprop.com/www/wp-settings.php(545): do_action()
#9 /webroot/m/y/mydub002/mydubaiprop.com/www/wp-config.php(106): require_once('...')
#10 /webroot/m/y/mydub002/mydubaiprop.com/www/wp-load.php(37): require_once('...')
#11 /webroot/m/y/mydub002/mydubaiprop.com/www/wp-blog-header.php(13): require_once('...')
#12 /webroot/m/y/mydub002/mydubaiprop.com/www/index.php(17): require('...')
#13 {main}
thrown in /webroot/m/y/mydub002/mydubaiprop.com/www/wp-includes/wp-db.php on line 2030