missing required active authority

When i create a transaction ,
{"ref_block_prefix":235743246,"extensions":[],"operations":[["account_create",{"owner":{"key_auths":[["STM5DfVj2UtVTDFdG8gnxhHGxEmhkh9nVJ4ky3Vt6ZKSQ86bftNE1",1]],"impossible":"false","weight_threshold":1,"empty":"false","account_auths":[]},"creator":"kent111","memo_key":"STM5DfVj2UtVTDFdG8gnxhHGxEmhkh9nVJ4ky3Vt6ZKSQ86bftNE1","fee":"0.100 STEEM","active":{"impossible":"false","weight_threshold":1,"key_auths":[["STM5DfVj2UtVTDFdG8gnxhHGxEmhkh9nVJ4ky3Vt6ZKSQ86bftNE1",1]],"empty":"false","account_auths":[]},"posting":{"impossible":"false","weight_threshold":1,"key_auths":[["STM5DfVj2UtVTDFdG8gnxhHGxEmhkh9nVJ4ky3Vt6ZKSQ86bftNE1",1]],"empty":"false","account_auths":[]},"new_account_name":"kent12","json_metadata":""}]],"expiration":"2024-08-14T15:09:14","ref_block_num":-29424,"signatures":["207159e975a14f974729f5e3ad1d65e1bf86f62eff7f05339bd1c3c8966f0aa69f1e476d61cf0deb2111161484c64786dcad10c1811f3afe672ad1a1f62e8085fe"]}

I got: "message -> missing required active authority:Missing Active Authority kent111";
But i have used my owner key. Plz help me! use public node:" https://api.steemit.com"