-o stratum+tcp://pool.dero.live:5555 -u Wallet_address.Diff+Worker1 -p x
This looks like a ccminer variant (e.g. - tpruvot); if so, then you need to specify the algo using the -a switch:
ccminer-x64 -a cryptonight -o stratum+tcp://pool.dero.live:5555 -u wallet.diff+workername -p x
I keep getting "no such command"..