TurtleBot3 Home Service Challenge

[suyunas]

Whilst doing the TurtleBot3 Home Service Challenge. https://emanual.robotis.com/docs/en/platform/turtlebot3/home_service_challenge/
@ 7.10.3.1.
I am having the following error:

Remote PC side:
#!/bin/bash
argc=$#
args=("$@")
if [ 0 -eq $argc ]
then
echo "need to argument that host ip for ssh connection"
echo "Usage: $0 [ip address] ..."
exit 1
fi
for((index = 0; index < $#; index++ ))
do
ssh-keygen -R ${args[$index]}
ssh-keyscan ${args[$index]} >> ~/.ssh/known_hosts
done

Turtlebot3 side:
#!/bin/bash
#check if other turtlebot3_core is already running
is_running=ps ax | grep turtlebot3_core
IFS=' ' read -ra is_runnings <<< "$is_running"
process_name=${is_runnings[4]}
if [ ${process_name} == "python" ]
then
echo "other turtlebot3_core is already running."
exit 1
fi

source /opt/ros/kinetic/setup.bash
source ~/catkin_ws/devel/setup.bash

ip_address=hostname -I
ip_address_trim=${ip_address%% * }
ip_address_no_space="$(echo -e "${ip_address_trim}" | tr -d '[:space:]')"
export ROS_HOSTNAME=${ip_address_no_space}

export TURTLEBOT3_MODEL=waffle_pi
exec "$@"

Somebody can help?