hi....am using the following example to list agents.....but am getting an error

async function getAssistants() {
  const response = await fetch('https://api.vapi.ai/assistant', {
    method: 'GET',
    headers: {
      'Content-Type': 'application/json',
      Authorization: `Bearer ${token}`,
    },
  });

  const data = await response.json();
  console.log(data);
}

fetchData().catch(console.error);