my cgminer.config
{
"pools" : [
   {
           "url" : "127.0.0.1:8772",
      "user" : "aaa",
      "pass" : "bbb"
        }
      
],

"intensity" : "12",
"expiry" : "1",
"failover-only" : true,
"log" : "5",
"no-restart" : true,
"queue" : "0",
"scan-time" : "1",
"worksize" : "128",
"temp-hysteresis" : "4",
"blake256" : true,
"vectors" : "1",
"no-submit-stale": true,
"gpu-threads" : "1",
"gpu-engine" : "965",
"gpu-fan" : "76",
"gpu-memclock" : "855",
"temp-cutoff" : "94",
"temp-overheat" : "88",
"temp-target" : "74",
"kernel-path" : "/"
}


and my keplercoin.conf
listen=1
gen=1
rpcallowip=127.0.0.1
rpcuser=aaa
rpcpassword=bbb
rpcport=8772
server=1
daemon=1
algo=blake


the diff on blake algo is 0, all block is rejected why?