Click will abort further execution because Python 3 was configured to use ASCII as encoding for the environment

I downloaded Quokka Python/Flask CMS to a CentOS7 server. Everything works fine with command

sudo python3 manage.py runserver --host 0.0.0.0 --port 80

Then I create a file /etc/init.d/quokkacms. The file contains following code

start() {
        echo -n "Starting quokkacms: "
        python3 /var/www/quokka/manage.py runserver --host 0.0.0.0 --port 80
        touch /var/lock/subsys/quokkacms
        return 0
}
stop() {
        echo -n "Shutting down quokkacms: "
        rm -f /var/lock/subsys/quokkacms
        return 0
}
case "$1" in
    start)
        start
        ;;
    stop)
        stop
        ;;
    status)

        ;;
    restart)
        stop
        start
        ;;

    *)
        echo "Usage: quokkacms {start|stop|status|restart}"
        exit 1
        ;;
esac
exit $?

But I get error when running sudo service quokkacms start

> RuntimeError: Click will abort further execution because Python 3 was > configured to use ASCII as encoding for the environment. Either switch > to Python 2 or consult http://click.pocoo.org/python3/ for
> mitigation steps.

It seems to me that it is the bash script. How come I get different results? Also I followed instructions in the link in the error message but still had no luck.

[update] I had already tried the solution provided by Click before I posted this question. Check the results below (i run in root):

[root@webserver quokka]# python3
Python 3.4.3 (default, Jan 26 2016, 02:25:35)
[GCC 4.8.5 20150623 (Red Hat 4.8.5-4)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import locale
>>> import codecs
>>> print(locale.getpreferredencoding())
UTF-8
>>> print(codecs.lookup(locale.getpreferredencoding()).name)
utf-8
>>> locale.getdefaultlocale()
('en_US', 'UTF-8')
>>> locale.CODESET
14
>>>

If you are trying to execute tests case you must set the following environment variables each time:

export LC_ALL=en_US.utf-8
export LANG=en_US.utf-8

Doing this each time will resolve the error.

It may also be possible to set this in your IDE run configuration as

LC_ALL=en_US.UTF-8;LANG=en_US.UTF-8

For example see the following setting in PyCharm 2016:

Adding more to the existing solutions:

If you see something like this error in Python 3:

Traceback (most recent call last):
  ...
RuntimeError: Click will abort further execution because Python 3 was
  configured to use ASCII as encoding for the environment. Either switch
  to Python 2 or consult http://click.pocoo.org/python3/ for
  mitigation steps.

You are dealing with an environment where Python 3 thinks you are restricted to ASCII data. The solution to these problems is different depending on which locale your computer is running in.

For instance, if you have a German Linux machine, you can fix the problem by exporting the locale to de_DE.utf-8:

export LC_ALL=de_DE.utf-8
export LANG=de_DE.utf-8

If you are on a US machine, en_US.utf-8 is the encoding of choice. On some newer Linux systems, you could also try C.UTF-8 as the locale:

export LC_ALL=C.UTF-8
export LANG=C.UTF-8

Taken from the Python 3 Surrogate Handling