Cannot connect to local daemon

[lowks]

The local daemon is running:

(ansible_test) ~/ansible-flask-example ❯❯❯ sudo service docker status                                                                  master
[sudo] password for lowks: 
● docker.service - Docker Application Container Engine
   Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)
   Active: active (running) since Isn 2016-05-16 15:44:25 MYT; 20min ago
     Docs: https://docs.docker.com
 Main PID: 11030 (docker)
    Tasks: 10
   Memory: 11.6M
      CPU: 766ms
   CGroup: /system.slice/docker.service
           └─11030 /usr/bin/docker daemon -H fd://

Mei 16 15:44:24 lowkster-laptop docker[11030]: time="2016-05-16T15:44:24.730479407+08:00" level=info msg="Firewalld running: false"
Mei 16 15:44:25 lowkster-laptop docker[11030]: time="2016-05-16T15:44:25.090426421+08:00" level=info msg="Default bridge (docker0) is assigned
Mei 16 15:44:25 lowkster-laptop docker[11030]: time="2016-05-16T15:44:25.872717944+08:00" level=warning msg="Your kernel does not support swap
Mei 16 15:44:25 lowkster-laptop docker[11030]: time="2016-05-16T15:44:25.926070283+08:00" level=info msg="Loading containers: start."
Mei 16 15:44:25 lowkster-laptop docker[11030]: time="2016-05-16T15:44:25.926117606+08:00" level=info msg="Loading containers: done."
Mei 16 15:44:25 lowkster-laptop docker[11030]: time="2016-05-16T15:44:25.926127029+08:00" level=info msg="Daemon has completed initialization"
Mei 16 15:44:25 lowkster-laptop docker[11030]: time="2016-05-16T15:44:25.926137294+08:00" level=info msg="Docker daemon" commit=20f81dd execdr
Mei 16 15:44:25 lowkster-laptop systemd[1]: Started Docker Application Container Engine.
Mei 16 15:44:25 lowkster-laptop docker[11030]: time="2016-05-16T15:44:25.930581015+08:00" level=info msg="API listen on /var/run/docker.sock"
Mei 16 15:45:16 lowkster-laptop systemd[1]: Started Docker Application Container Engine.

But when I run the command ansible-test app it spits out this:

(ansible_test) ~/ansible-flask-example ❯❯❯ ansible-test app                                                                            master
Cannot connect to the Docker daemon. Is the docker daemon running on this host?
Traceback (most recent call last):
  File "/home/lowks/virtualenvs/ansible_test/bin/ansible-test", line 69, in <module>
    main(context)
  File "/home/lowks/virtualenvs/ansible_test/bin/ansible-test", line 45, in main
    '-t', DOCKER_CONTAINER, '.']
  File "/usr/lib/python2.7/subprocess.py", line 541, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['docker', 'build', '-t', 'testbox', '.']' returned non-zero exit status 1