fs unlink cant find the required path

I have the following delete function in expressjs but when I try use the path of the element I want to remove it appears as undefined yet I've revised the tutorial and still dont see where the problem is:

router.delete('/messagedelete/:empId', function (req, res) {

  Message.remove({empId: req.params.empId}, function(err, message) {
      console.log(message.path);
      console.log("got inside");
    if(err) { 
       return res.send({status: "200", response: "fail"});
    }
      console.log(message.path);
    fs.unlink(message.path, function() {
      res.send ({
        status: "200",
        responseType: "string",
        response: "success"
      });     
    });
 }); 
});

I import fs like this at the top of the file:

const fs = require('fs');

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