nrpe unable to read output

i have a very little script which is running when i use   $ ./check_dock
docker -com.... ok cpuuerc 0.xx%
 when i used in $ ./check_nrp -H "ip/localhost/127.0.0.1" -c check_dock
return:  NRPE: Unable to read output
all other command i defined in nrpe is running.
What i missing here?

my check_dock scripts is:
-------
#!/bin/bash -el
#
#
#
# Author: Bahman Sharzad
# Mail: bshmsn.sharzad@process-factory.dk

SUDO=/usr/bin/sudo
alias direc="cd /usr/local/nagios/libexec"
# . check docker container
ERROR_CODE1=-1
statu=$((sudo /usr/local/nagios/libexec/check_docker -n $1 -c 80,90) | awk '{print $2}')
#echo $statu
all=$(sudo /usr/local/nagios/libexec/check_docker -n $1 -c 80,90)
#echo $all
if [ $statu = 'WARN' ]; then
        echo $all
        ERROR_CODE1=1
elif [ $statu = 'CRIT' ]; then
        echo $all
        ERROR_CODE1=2
elif [ $statu = 'OK' ]; then
        echo $all
        ERROR_CODE1=0
fi
exit $ERROR_CODE1
------

and command in nrpe is
--
command[check_dock]=/usr/local/nagios/libexec/check_dock docker-compose_mongodb_1
---
i run command :  $ sudo ./check_nrpe -H 127.0.0.1 -c check_dock
NRPE: Unable to read output