Title: Error when installed this plugin. Last modified: August 31, 2016 --- # Error when installed this plugin. * [vijish](https://wordpress.org/support/users/vijish/) * (@vijish) * [10 years, 3 months ago](https://wordpress.org/support/topic/error-when-installed-this-plugin/) * Warning: Missing argument 2 for wpdb::prepare(), called in /data/17/4/63/17/4389017/ user/5093946/htdocs/wp-content/plugins/member-mailbox/mmail-options.php on line 30 and defined in /data/17/4/63/17/4389017/user/5093946/htdocs/wp-includes/wp- db.php on line 1246 * Also is there any way to send message to all users? * [https://wordpress.org/plugins/member-mailbox/](https://wordpress.org/plugins/member-mailbox/) Viewing 1 replies (of 1 total) * Plugin Author [cbfreeman](https://wordpress.org/support/users/cbfreeman/) * (@cbfreeman) * [9 years, 8 months ago](https://wordpress.org/support/topic/error-when-installed-this-plugin/#post-8235264) * I just installed the plugin on a single use site with no problem. Please see your site admin. Are you using a multi-user site? Viewing 1 replies (of 1 total) The topic ‘Error when installed this plugin.’ is closed to new replies. * ![](https://s.w.org/plugins/geopattern-icon/member-mailbox_9dbadf.svg) * [WP Promo Emails](https://wordpress.org/plugins/member-mailbox/) * [Frequently Asked Questions](https://wordpress.org/plugins/member-mailbox/#faq) * [Support Threads](https://wordpress.org/support/plugin/member-mailbox/) * [Active Topics](https://wordpress.org/support/plugin/member-mailbox/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/member-mailbox/unresolved/) * [Reviews](https://wordpress.org/support/plugin/member-mailbox/reviews/) ## Tags * [wpdb::prepare](https://wordpress.org/support/topic-tag/wpdbprepare/) * 1 reply * 2 participants * Last reply from: [cbfreeman](https://wordpress.org/support/users/cbfreeman/) * Last activity: [9 years, 8 months ago](https://wordpress.org/support/topic/error-when-installed-this-plugin/#post-8235264) * Status: not resolved