pm2的快速文件上传

Question

I have created node app to upload image to server with some form data. this is my function

var express = require('express');
var router = express.Router();
var app = express();
var fileUpload = require('express-fileupload');
var bodyParser = require('body-parser');
var mongoose = require('mongoose');
var cors = require('cors')
var Job = require('../models/job');

exports.addJobs = function (req, res) {
if (req.files && req.body) {

let address = {
  'city': req.body.city,
  'street': req.body.street,
  'houseNumber': req.body.houseNumber
}

var job = new Job();
job.userId = req.body.userId;
job.categoryId = req.body.categoryId;
job.subCatId = req.body.subCatId;
job.description = req.body.description;
job.dueDate = req.body.dueDate;
job.dueTime = req.body.dueTime;
job.priceLimit = req.body.priceLimit;
job.longitude = req.body.longitude;
job.latitude = req.body.latitude;
job.address = address;

job.save(function (err) {
  if (err) {

    res.send(err);
  } else {

      if (!req.files) {
        return res.status(400).json({ message: 'No files were upload' });
      } else {

        let sampleFile = req.files.image;
        let type = req.files.image.mimetype.split('/')[1];

        let imgName = job._id;
        let filename = 'jobimages'
        let imgUrl = 'http://156.6*.***.***:8085/images/' + filename + '/' + imgName + '.' + type;
        let id = new mongoose.Types.ObjectId(imgName);

        Job.findById(id)
          .exec(function (err, result) {
            if (err) {

            } else {
              if (result !== null) {
                sampleFile.mv('./public/images/'+ filename + '/' + imgName + '.' + type, function (err) {
                  if (err) {
console.log('this is the error place')
                  } else {
                    var imagePath = {
                      $set: { imageUrl: imgUrl }
                    }

                      Job.findByIdAndUpdate(id, imagePath, function job(err, result) {
                        if (err) {

                        } else {

                          console.log('Image uploaded')
                        }
                      })

                  }
                });
              }
            }
          });
      }

    res.json({ message: 'success', details: "Added job successfully", content: job });
  }
});
 } else {
res.status(400).json({message: 'no image or body'})
}
};

when I put this code to server and run it using command 'node app.js' it add data to jobs collection and also upload image successfully and update imageUrl also. but in same server when i use pm2 it only add job to collection but fails to upload image. I used 'pm2 monit' and it prints my console.log('this is the error place') in above code and also when i print error it gives,

Error: ENOENT: no such file or directory,open 
'./public/images/jobimages/5bec612c5f3da83c0f3.jpeg'
errno: -2,
code: 'ENOENT',
syscall: 'open',
path: './public/images/jobimages/5bec612c5f/3da83c0f340c09.jpeg' }

i can't figure out the problem here please help?