I am facing InvalidServerResponse while sending notification

I am not able to send any notification to my android or ios device. We upgraded to a newer version, but our notification still fails. I have attached my sample code here. Please let me know if need to change anything. But it worked fine before. The same code now fails.

       var message = {
          to: doc.token,
          collapse_key: 'green',
          notification: {
            title: title,
            body: body
          }
        };
        if(image) {
          message.notification.image = image;
        }
        fcm.send(message, function (err, response) {
          if(err) {
            reject(err);
          } else {
            resolve(response);
          }
        })