Uncaught TypeError Failed to set the ‘voice’ property on ‘SpeechSynthesisUtterance’: Failed to convert value to ‘SpeechSynthesisVoice’

How can I change voice value of speechSynthesisUtteranceObject to other value like number or string without getting this error?

SpeechSynthesisUtterance Object:
 SpeechSynthesisUtterance {text: 'hi', lang: '', voice: null, volume: 1, rate: 1, …}
    

 html.html:49  Uncaught TypeError: Failed to set the 'voice' property on 'SpeechSynthesisUtterance': Failed to convert value to 'SpeechSynthesisVoice'.
    at HTMLSelectElement.changeSpeaker

When I changed value of speechSynthesisUtterance.voice it returned me error