EDIT - I am using "Equihash CPU&GPU Miner for NiceHash v0.5c" obtained from https://github.com/nicehash/nheqminer HEAD commit (b9900ff8e3c6f8e5a46af18db454f2a2082d9f46).
The miner you're using has not been updated to deal with the other Equihash coins, least of all, Bitcoin Gold.
Nicehash developed/supported/funded miners also don't work anywhere but on NiceHash, though there are older exceptions.