Unable to upload an image file to PUBLISHED node.acs application

Hello Experts

I am trying to build a front end to my ACS database. As a part of the admin front end, users will upload images and I am using Photos object to save them. I am using following code to upload the photos to cloud db and it works like a charm on my local system.

var data = {
    session_id:req.session.session_id,
        photo: req.files.photo_file
    };
    data['photo_sizes[medium_500]'] = '500x333';
    data['photo_sync_sizes[]'] = 'medium_500';
 
    ACS.Photos.create(data, function(e) {
        if(e.success && e.success === true){
          // Update custom object with this photo
          ACS.Objects.update({
            session_id:req.session.session_id,
            classname:objname,
            id:objid,
            fields: {
                photo_id:e.photos[0].id,
                photo_url:e.photos[0].urls.medium_500
            }
          },function(data) {
                if(data.success) {
                    // console.log('Updated successfully:' + JSON.stringify(data));
                    res.send(data);
                }else {
                    console.log('Error:\n' +
                    ((data.error && data.message) || JSON.stringify(data)));
                }
            }
          );
          //res.send(data);
        }else{
          logger.debug('Error: ' + JSON.stringify(e));
          req.session.flash = {msg:e.message, r:0};
          res.redirect('/');
        }
    });

But when I publish the app to the as Node.acs service, while uploading the images, app crashes. Running the "loglist" command produced following output.

[ERROR] [1233] Error: EACCES, open '/tmp/292fb15dcab44f58a315515bd9e70a8a'

This is the path that HTML form sends from the client as part of the form data that contains the file input. Please let me know how to solve this issue.

Thanks and Regards,

Niranjan