UnhandledPromiseRejectionWarning: This error originated either by throwing inside of an async function without a catch block

I am getting following error in my Node-Express App

UnhandledPromiseRejectionWarning: Unhandled promise rejection. This
error originated either by throwing inside of an async function
without a catch block, or by rejecting a promise which was not handled
with .catch(). (rejection id: 4)

To say the least, I have created a helper function which looks something like this

const getEmails = (userID, targettedEndpoint, headerAccessToken) => {
    return axios.get(base_url + userID + targettedEndpoint,  { headers: {"Authorization" : `Bearer ${headerAccessToken}`} })
    .catch(error => { throw error})
}

and then I am importing this helper function

const gmaiLHelper = require("./../helper/gmail_helper")

and calling it inside my api route like this

router.get("/emailfetch", authCheck, async (req, res) => {
  //listing messages in users mailbox 
  let emailFetch = await gmaiLHelper.getEmails(req.user._doc.profile_id , '/messages', req.user.accessToken)
  .catch(error => { throw error})
  emailFetch = emailFetch.data
  res.send(emailFetch)
})

From my end, I think I am handling the error by using catch block.

Question: Can someone explain me why I am getting the error and how can I fix it?