the first blocks (#19) were mined via daemon. then i tried to mine the #20 with miner+proxy but the daemon complains.
just a feedback, i perhaps did something wrong.
Because there is cryptonight algo before particular height. You need to change 1 to 0 here
https://github.com/sammy007/monero-stratum/blob/aeon/hashing/src/hashing.c#L4 and run
make again. Or modify aeond to enforce light algo since block 1.
indeed, i forgot to modify daemon to accept light algo from the first blocks.
so in daemon, i moved hardfork height to first blocks and all is ok now. Cryptonight-light blocks are accepted, aeon-stratum code is untouched.

thanks you sammy007