oservium cannot add_device but can snmpwalk and fping - centos6

Question

Even after I made sure fping in config same as whereis fping output, I'm still cannot add any device, even localhost.
I also had made sure that snmpwalk successul before running add_device.php
OS: Centos 6 amd64
[root#nms observium]# ./add_device.php -d 127.0.0.1 public v2c
DEBUG!
Observium CE 0.15.6.6430
Add Device(s)
Wrong process status! Try fix..
CMD[/opt/observium/scripts/distro]
EXITCODE[0]
RUNTIME[0.0295s]
STDOUT[
Linux|2.6.32-573.8.1.el6.x86_64|amd64|CentOS|6.7
]
CMD[/usr/bin/env python --version 2>&1]
EXITCODE[0]
RUNTIME[0.039s]
STDOUT[
Python 2.6.6
]
SQL[SELECT version()]
RUNTIME[0.01287103s]
CMD[/usr/bin/snmpget --version 2>&1]
EXITCODE[0]
RUNTIME[0.0169s]
STDOUT[
NET-SNMP version: 5.5
]
CMD[/usr/bin/rrdtool --version |head -n1]
EXITCODE[0]
RUNTIME[0.0891s]
STDOUT[
RRDtool 1.3.8 Copyright 1997-2009 by Tobias Oetiker <tobi#oetiker.ch>
]
Software versions:
OS: Linux 2.6.32-573.8.1.el6.x86_64 [amd64] (CentOS 6.7)
PHP: 5.3.3
Python: Python 2.6.6
MySQL: 5.1.73
SNMP: NET-SNMP 5.5
RRDtool: 1.3.8
Try to add 127.0.0.1:
SQL[SELECT COUNT(*) FROM `devices` WHERE `hostname` = '127.0.0.1']
RUNTIME[0.04451895s]
Could not resolve 127.0.0.1.
Devices failed: 1.
Any tips/hints would be great.

Answer 1

Solved by using hostname instead of IP address
Add hostname entry in /etc/hosts of observium server, then run ./add_device hostname community v2c