stop whent i run snapshot

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Can't access dashboad, can't do anythings. I had try to change name of plugins folder (for deactivated all plugins), reset my htaccess file to default (RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]

# add a trailing slash to /wp-admin
RewriteRule ^wp-admin$ wp-admin/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule ^(wp-(content|admin|includes).*) $1 [L]
RewriteRule ^(.*\.php)$ $1 [L]
RewriteRule . index.php [L])

whent i run snapshot, i also run ECURITY TWEAKS, maybe error whent i go to "Change default database prefix" step
error_log file have many line:
[02-May-2017 16:04:08 UTC] WordPress database error Table 'couponer_truyenthong.wp_blogs' doesn't exist for query SELECT blog_id FROM wp_blogs WHERE domain IN ( '' ) AND path IN ( '/wp-signup.php/', '/' ) ORDER BY CHAR_LENGTH(path) DESC LIMIT 1 made by require('wp-load.php'), require_once('wp-config.php'), require_once('wp-settings.php'), require('wp-includes/ms-settings.php'), ms_load_current_site_and_network, get_site_by_path, get_sites, WP_Site_Query->query, WP_Site_Query->get_sites, WP_Site_Query->get_site_ids

how can i get my site back?
Please help me