Facebook Graph API Error 400

[chunky1405]

I have problems to this code:

const axios = require('axios')

/**

• Get Facebook details
• @title Get Facebook details
• @category
• @author
  */
  const myAction = async () => {
  try {
  var headers = {
  'Content-Type': 'application/json'
  }
  var endpoint =
  'https://graph.facebook.com/' +
  event.target +
  '?fields=name,first_name,last_name&access_token=' +
  session.fb_access_token
  var response = await axios.get(endpoint, { headers: headers })
  // store to user object
  user['full_name'] = response.data.name
  session.full_name = response.data.name
  user['first_name'] = response.data.first_name
  user['last_name'] = response.data.first_name
  bp.logger.debug(JSON.stringify(response.data))
  } catch (err) {
  bp.logger.warn(err)
  }
  }

return myAction()

But I got Error 400 on my end. Can you help me to hinder on this one? Thanks.