unable to verify the first certificate

I just follow your steps and setup probject, but it did not work

Error: unable to verify the first certificate
    at TLSSocket.onConnectSecure (node:_tls_wrap:1519:34)
    at TLSSocket.emit (node:events:379:20)
    at TLSSocket._finishInit (node:_tls_wrap:943:8)
    at TLSWrap.ssl.onhandshakedone (node:_tls_wrap:716:12)
    at TLSWrap.callbackTrampoline (node:internal/async_hooks:131:14)