using, xmr-stak-v2.4.1-cuda8 and string below, I am getting

--noCPU --noAMD --currency monero7 -o stratum+tcp://cryptonightv7.USA.nicehash.com:3363 -u .$rigName -p x

[2018-04-08 20:20:52] : Pool stratum+tcp://cryptonightv7.USA.nicehash.com:3363 c
onnected. Logging in...
[2018-04-08 20:20:52] : Difficulty changed. Now: 100001.
[2018-04-08 20:20:52] : Pool logged in.
[2018-04-08 20:21:14] : Result rejected by the pool.
[2018-04-08 20:21:38] : New block detected.
[2018-04-08 20:21:44] : New block detected.
[2018-04-08 20:21:53] : New block detected.
[2018-04-08 20:22:00] : New block detected.
[2018-04-08 20:22:05] : Result rejected by the pool.
[2018-04-08 20:22:21] : New block detected.
[2018-04-08 20:22:23] : Result rejected by the pool.
[2018-04-08 20:22:29] : New block detected.
[2018-04-08 20:22:38] : New block detected.
[2018-04-08 20:22:51] : New block detected.
[2018-04-08 20:23:01] : New block detected.
[2018-04-08 20:23:32] : New block detected.