what is wrong?
sgminer.exe -k sha256t -o stratum+tcp://oc.suprnova.cc:8588 -u user.worker -p x -I 21 -w 64 -g 2
Invalid parameter to set_kernel
Are you using the sgminer that was coded specifically for (oc) onecoin?
Because it sounds like your miner doesn't support sha256t.