bitcoin core – ./minerd –url=127.0.0.1:6332 1 miner threads began, utilizing ‘scrypt’ algorithm. HTTP request failed: json_rpc_call failed, retry after 30 seconds

I am experimenting mycoin working the cpuminer utilizing the command: ./minerd –url=http://127.0.0.1:6332 –user=myuser –pass=mypassword –coinbase-addr=my_address

I attempted to run this as a result of blocks are usually not generated since days
./bigcoin-cli –datadir=<dir_to_wallet> generatetoaddress 1 <wallet_address>

I hold getting empty array as end result
[
]

checking my debug.log file i’ve
2022-06-08 10:37:30 CreateNewBlock(): whole measurement: 748297 block weight: 2993188 txs: 546 charges: 1531988779 sigops 4768

Please anybody assist, i do not know the place the issue is