I'm having very similar troubles to another person above me.

./minerd --url=stratum+tcp://xmr.suprnova.cc:5222 --userpass=JTrebs.BlooCPU:bluesmoke
[2017-01-03 14:59:22] Starting Stratum on stratum+tcp://xmr.suprnova.cc:5222
[2017-01-03 14:59:22] Binding thread 0 to cpu 0
[2017-01-03 14:59:22] Binding thread 1 to cpu 1
[2017-01-03 14:59:22] Binding thread 2 to cpu 2
[2017-01-03 14:59:22] Binding thread 3 to cpu 3
[2017-01-03 14:59:22] 4 miner threads started, using 'scrypt' algorithm.
[2017-01-03 14:59:23] JSON-RPC call failed: {
   "code": -1,
   "message": "invalid method"
}
[2017-01-03 14:59:23] ...retry after 30 seconds


Is this an issue with the pool?