How to fix permission error on Centos, when using FluentD td-agent?

Change the following two lines in /etc/init.d/td-agent:

#!/bin/bash
### BEGIN INIT INFO
# Provides:          td-agent
# Required-Start:    $network $local_fs
# Required-Stop:     $network $local_fs
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: data collector for Treasure Data
# Description:       td-agent is a data collector
### END INIT INFO


export PATH=/sbin:/usr/sbin:/bin:/usr/bin

TD_AGENT_NAME=td-agent
TD_AGENT_HOME=/opt/td-agent
TD_AGENT_DEFAULT=/etc/sysconfig/td-agent
TD_AGENT_USER=root #td-agent
TD_AGENT_GROUP=root #td-agent
TD_AGENT_RUBY=/opt/td-agent/embedded/bin/ruby
TD_AGENT_BIN_FILE=/usr/sbin/td-agent
TD_AGENT_LOG_FILE=/var/log/td-agent/td-agent.log
TD_AGENT_PID_FILE=/var/run/td-agent/td-agent.pid
TD_AGENT_LOCK_FILE=/var/lock/subsys/td-agent
TD_AGENT_OPTIONS="--use-v1-config"