javascript - I get the error : Cannot read property 'then' of undefined when I run my react project

Question

I get the error :

Cannot read property 'then' of undefined

when I run my react project The code is as follows

getQuestions = () => {
  quickService().then(question => {
    this.setState({
      questionBank: question
    });
  });
};

question from:https://stackoverflow.com/questions/65840809/i-get-the-error-cannot-read-property-then-of-undefined-when-i-run-my-react-p