Cacti can not fetch mysql performance tuning data

[jinchao]

Cacti can not fetch mysql performance tuning data,below is Screenshot:


below is cacti's error.log:
11/23/2015 05:43:01 PM - SPINE: Poller[0] Host[8] ERROR: Empty result [X.X.X.X]: 'path_php_binary -q path_cacti/scripts/ss_get_mysql_stats.php --host hostname --items bd,be,bf,bi,bl,bn --user username --pass password'
11/23/2015 05:43:01 PM - SYSTEM STATS: Time:0.5667 Method:spine Processes:1 Threads:1 Hosts:4 HostsPerProcess:4 DataSources:27 RRDsProcessed:27

Can anybody help me?