hash – can not generate bitcoin first block

I’ve obtain bitcoin supply and alter genesis in regtest. and i attempt to generate 1 block by command ./bitcoin-cli -generate 1 it doesn’t present any mining block. i strive over 10 instances however it’s nonetheless the identical consequence why?
right here the consequence:
{
"deal with": "tc1qltnl9t23yshlexxxxxxxxxxxx",
"blocks": [
]
}
please kindly advise what occur what bitcoin supply code ?