I'm trying to get scrypt-n to work with sgminer. Can somebody please check what is wrong? I get 100% rejected and sgminer says "low difficulty share of 0.00"

{
"pools" : [
        {
                "url" : "stratum+tcp://useast.blackcoinpool.com:6666",
                "user" : "XXX",
                "pass" : "XXX"
        }
]
,
"xintensity" : "4",
"vectors" : "1",
"worksize" : "256",
"kernel" : "psw",
"algorithm" : "adaptive-n-factor",



"scrypt" : true,


"temp-hysteresis" : "3",
"shares" : "0"
}