First Include This in your wp-config.php file :

/* Multisite */
define( ‘WP_ALLOW_MULTISITE’, true );
define(‘MULTISITE’, true);
define(‘SUBDOMAIN_INSTALL’, true);
$base = ‘/’;
define(‘DOMAIN_CURRENT_SITE’, ‘missawoulabacanada.com’);
define(‘PATH_CURRENT_SITE’, ‘/’);
define(‘SITE_ID_CURRENT_SITE’, 1);
define(‘BLOG_ID_CURRENT_SITE’, 1);
define( ‘SUNRISE’, ‘on’ );
/* That’s all, stop editing! Happy blogging. */

Multisite .htaccess

RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ – [L]

# uploaded files
RewriteRule ^files/(.+) wp-includes/ms-files.php?file=$1 [L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ – [L]
RewriteRule . index.php [L]

Sunrise code, which must be in wp-content :

/**sunrise.php**/

<?php
if ( !defined( ‘SUNRISE_LOADED’ ) )
define( ‘SUNRISE_LOADED’, 1 );

if ( defined( ‘COOKIE_DOMAIN’ ) ) {
die( ‘The constant “COOKIE_DOMAIN” is defined (probably in wp-config.php). Please remove or comment out that define() line.’ );
}

// let the site admin page catch the VHOST == ‘no’
$wpdb->dmtable = $wpdb->base_prefix . ‘domain_mapping’;
$dm_domain = $wpdb->escape( $_SERVER[ ‘HTTP_HOST’ ] );

if( ( $nowww = preg_replace( ‘|^www\.|’, ”, $dm_domain ) ) != $dm_domain )
$where = $wpdb->prepare( ‘domain IN (%s,%s)’, $dm_domain, $nowww );
else
$where = $wpdb->prepare( ‘domain = %s’, $dm_domain );

$wpdb->suppress_errors();
$domain_mapping_id = $wpdb->get_var( “SELECT blog_id FROM {$wpdb->dmtable} WHERE {$where} ORDER BY CHAR_LENGTH(domain) DESC LIMIT 1” );
$wpdb->suppress_errors( false );
if( $domain_mapping_id ) {
$current_blog = $wpdb->get_row(“SELECT * FROM {$wpdb->blogs} WHERE blog_id = ‘$domain_mapping_id’ LIMIT 1”);
$current_blog->domain = $_SERVER[ ‘HTTP_HOST’ ];
$current_blog->path = ‘/’;
$blog_id = $domain_mapping_id;
$site_id = $current_blog->site_id;

define( ‘COOKIE_DOMAIN’, $_SERVER[ ‘HTTP_HOST’ ] );

$current_site = $wpdb->get_row( “SELECT * from {$wpdb->site} WHERE id = ‘{$current_blog->site_id}’ LIMIT 0,1” );
$current_site->blog_id = $wpdb->get_var( “SELECT blog_id FROM {$wpdb->blogs} WHERE domain='{$current_site->domain}’ AND path='{$current_site->path}'” );
if( function_exists( ‘get_current_site_name’ ) )
$current_site = get_current_site_name( $current_site );

define( ‘DOMAIN_MAPPING’, 1 );
}
?>