Fatal error: Uncaught ValueError: Unknown format specifier " in /home/uiomtbbr/public_html/wp-includes/class-wpdb.php:1757
Stack trace:
#0 /home/uiomtbbr/public_html/wp-includes/class-wpdb.php(1757): vsprintf('\x00\x00\x00\x00SET NAMES '...', Array)
#1 /home/uiomtbbr/public_html/wp-includes/class-wpdb.php(931): wpdb->prepare('\x00\x00\x00\x00SET NAMES '...', 'utf8mb4')
#2 /home/uiomtbbr/public_html/wp-includes/class-wpdb.php(2038): wpdb->set_charset(Object(mysqli))
#3 /home/uiomtbbr/public_html/wp-includes/class-wpdb.php(772): wpdb->db_connect()
#4 /home/uiomtbbr/public_html/wp-includes/load.php(724): wpdb->__construct('uiomtbbr_u4axiv...', 'c;87*,TLfC9:X24...', 'uiomtbbr_db4axi...', 'localhost:3306')
#5 /home/uiomtbbr/public_html/wp-settings.php(136): require_wp_db()
#6 /home/uiomtbbr/public_html/wp-config.php(95): require_once('/home/uiomtbbr/...')
#7 /home/uiomtbbr/public_html/wp-load.php(50): require_once('/home/uiomtbbr/...')
#8 /home/uiomtbbr/public_html/wp-blog-header.php(13): require_once('/home/uiomtbbr/...')
#9 /home/uiomtbbr/public_html/index.php(17): require('/home/uiomtbbr/...')
#10 {main}

Next 
  thrown in /home/uiomtbbr/public_html/wp-includes/class-wpdb.php on line 1757