Title: ms_not_installed Published: April 25, 2014 Last modified: February 24, 2026 --- # ms_not_installed( string $domain, string $path ) ## In this article * [Description](https://developer.wordpress.org/reference/functions/ms_not_installed/?output_format=md#description) * [Parameters](https://developer.wordpress.org/reference/functions/ms_not_installed/?output_format=md#parameters) * [Source](https://developer.wordpress.org/reference/functions/ms_not_installed/?output_format=md#source) * [Related](https://developer.wordpress.org/reference/functions/ms_not_installed/?output_format=md#related) * [Changelog](https://developer.wordpress.org/reference/functions/ms_not_installed/?output_format=md#changelog) [ Back to top](https://developer.wordpress.org/reference/functions/ms_not_installed/?output_format=md#wp--skip-link--target) This function’s access is marked private. This means it is not intended for use by plugin or theme developers, only by core. It is listed here for completeness. Displays a failure message. ## 󠀁[Description](https://developer.wordpress.org/reference/functions/ms_not_installed/?output_format=md#description)󠁿 Used when a blog’s tables do not exist. Checks for a missing $[wpdb](https://developer.wordpress.org/reference/classes/wpdb/)- >site table as well. ## 󠀁[Parameters](https://developer.wordpress.org/reference/functions/ms_not_installed/?output_format=md#parameters)󠁿 `$domain`stringrequired The requested domain for the error to reference. `$path`stringrequired The requested path for the error to reference. ## 󠀁[Source](https://developer.wordpress.org/reference/functions/ms_not_installed/?output_format=md#source)󠁿 ```php function ms_not_installed( $domain, $path ) { global $wpdb; if ( ! is_admin() ) { dead_db(); } wp_load_translations_early(); $title = __( 'Error establishing a database connection' ); $msg = '

' . $title . '

'; $msg .= '

' . __( 'If your site does not display, please contact the owner of this network.' ) . ''; $msg .= ' ' . __( 'If you are the owner of this network please check that your host’s database server is running properly and all tables are error free.' ) . '

'; $query = $wpdb->prepare( 'SHOW TABLES LIKE %s', $wpdb->esc_like( $wpdb->site ) ); if ( ! $wpdb->get_var( $query ) ) { $msg .= '

' . sprintf( /* translators: %s: Table name. */ __( 'Database tables are missing. This means that your host’s database server is not running, WordPress was not installed properly, or someone deleted %s. You really should look at your database now.' ), '' . $wpdb->site . '' ) . '

'; } else { $msg .= '

' . sprintf( /* translators: 1: Site URL, 2: Table name, 3: Database name. */ __( 'Could not find site %1$s. Searched for table %2$s in database %3$s. Is that right?' ), '' . rtrim( $domain . $path, '/' ) . '', '' . $wpdb->blogs . '', '' . DB_NAME . '' ) . '

'; } $msg .= '

' . __( 'What do I do now?' ) . ' '; $msg .= sprintf( /* translators: %s: Documentation URL. */ __( 'Read the Debugging a WordPress Network article. Some of the suggestions there may help you figure out what went wrong.' ), __( 'https://developer.wordpress.org/advanced-administration/debug/debug-network/' ) ); $msg .= ' ' . __( 'If you are still stuck with this message, then check that your database contains the following tables:' ) . '

'; wp_die( $msg, $title, array( 'response' => 500 ) ); } ``` [View all references](https://developer.wordpress.org/reference/files/wp-includes/ms-load.php/) [View on Trac](https://core.trac.wordpress.org/browser/tags/6.9.4/src/wp-includes/ms-load.php#L466) [View on GitHub](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/ms-load.php#L466-L512) ## 󠀁[Related](https://developer.wordpress.org/reference/functions/ms_not_installed/?output_format=md#related)󠁿 | Uses | Description | | [wpdb::esc_like()](https://developer.wordpress.org/reference/classes/wpdb/esc_like/)`wp-includes/class-wpdb.php` | First half of escaping for `LIKE` special characters `%` and `_` before preparing for SQL. | | [wp_load_translations_early()](https://developer.wordpress.org/reference/functions/wp_load_translations_early/)`wp-includes/load.php` | Attempts an early load of translations. | | [dead_db()](https://developer.wordpress.org/reference/functions/dead_db/)`wp-includes/functions.php` | Loads custom DB error or display WordPress DB error. | | [wpdb::tables()](https://developer.wordpress.org/reference/classes/wpdb/tables/)`wp-includes/class-wpdb.php` | Returns an array of WordPress tables. | | [__()](https://developer.wordpress.org/reference/functions/__/)`wp-includes/l10n.php` | Retrieves the translation of $text. | | [is_admin()](https://developer.wordpress.org/reference/functions/is_admin/)`wp-includes/load.php` | Determines whether the current request is for an administrative interface page. | | [wp_die()](https://developer.wordpress.org/reference/functions/wp_die/)`wp-includes/functions.php` | Kills WordPress execution and displays HTML page with an error message. | | [wpdb::get_var()](https://developer.wordpress.org/reference/classes/wpdb/get_var/)`wp-includes/class-wpdb.php` | Retrieves one value from the database. | | [wpdb::prepare()](https://developer.wordpress.org/reference/classes/wpdb/prepare/)`wp-includes/class-wpdb.php` | Prepares a SQL query for safe execution. | [Show 5 more](https://developer.wordpress.org/reference/functions/ms_not_installed/?output_format=md#) [Show less](https://developer.wordpress.org/reference/functions/ms_not_installed/?output_format=md#) ## 󠀁[Changelog](https://developer.wordpress.org/reference/functions/ms_not_installed/?output_format=md#changelog)󠁿 | Version | Description | | [4.4.0](https://developer.wordpress.org/reference/since/4.4.0/) | The `$domain` and `$path` parameters were added. | | [3.0.0](https://developer.wordpress.org/reference/since/3.0.0/) | Introduced. | ## User Contributed Notes You must [log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fdeveloper.wordpress.org%2Freference%2Ffunctions%2Fms_not_installed%2F) before being able to contribute a note or feedback.