wallet be open when i try start mining
lemon.conf created by me, he initially did not exist
cpuminer.exe - not work
http://localhost:127.0.0.1 - also same problem
work mining from wallet with comand setgenerate true. But it use only 25% cpu

Would you please try to read?
cpuminer -a argon2 -o localhost:28443 -O rpcname:rpcpassword --no-getwork --coinbase-addr=your address
No matter which miner you use,fill it there, choose algorithm, no "http://", and no -u and -p,but -O name:password