GlusterFS not starting and not creating volume

I am trying to setup a cluster in which I can have wordpress Installed with glusterFS so that The master node will be running the actual copy of wordpress and other two nodes will have its replica. Also I want to setup the Master slave Mysql setup. I have installed Mysql server, GlusterFS server, nginx server on three droplets and fourth one have Nginx Load balancer Installed. The problem is that I am not able to create a GlusterFS volume, below are the errors I am getting during building that FS.

command used :

gluster volume create file_store replica 2 transport tcp master.com:/gluster slave1.com:/gluster slave2.com:/gluster slave3.com:/gluster force;

gluster volume create file_store replica 2 transport tcp master.com:/gluster slave1.com:/gluster slave2.com:/gluster force;

gluster volume create file_store replica 2 transport tcp master.com:/gluster slave1.com:/gluster force;

I tried these commands and also tried Private IP in place of hostname and also tried doing it by removing force in the end.

Here is the error which I got.

Wrong brick and use <hostname> etc etc or operation failed

Please help me resolve the issue. I have been developing it by using below tutorial

https://www.digitalocean.com/community/tutorials/automating-the-deployment-of-a-scalable-wordpress-site

I have followed all the steps as they are in doc but not worked for me. I am stuck at GlusterFS now.

Also I tried to restart GlusterFS server and it doesn't even start now. It says GlusterFS server started but when I check the status of service it says Failed

Please Help.

Thanks In Advance