Cloud firestore emulator not running

Hi, I’m currently working with firebase cloud function, when I run the code below and copy the endpoint to postman it throws the error status 500 " something went wrong"
and I get an error in the terminal: " The Cloud Firestore emulator is not running, so calls to Firestore will affect production." and: "External network resource requested!

Here’s the code:

exports.createScream = functions.https.onRequest((req, res) => {
   const newScream = {
      body: req.body.body,
      userHandle: req.body.userHandle,
      createdAt: admin.firestore.Timestamp.fromDate(new Date())

   .then((doc) => {
      res.json({ message: 'document ${} created successfully'});
   .catch( (err) => {
       res.status(500).json({ error: 'something went wrong'});

I’ve tried everything I googled but I get the same result.
Someone should please help me out. Thank you in advance