No module named websocket

[elcreator]

I'm trying to fresh install this on Raspbian but lack of websocket module prevents from successful execution. I have tried troubleshoot this by installing websocket-related things modules but it was not helpful.

pip install websocket-client
Requirement already satisfied: websocket-client in /usr/local/lib/python2.7/dist-packages (0.51.0)

pi@raspberrypi:~/ws $ pip install websocket
Requirement already satisfied: websocket in /usr/local/lib/python2.7/dist-packages (0.2.1)
Requirement already satisfied: greenlet in /usr/local/lib/python2.7/dist-packages (from websocket) (0.4.14)
Requirement already satisfied: gevent in /usr/local/lib/python2.7/dist-packages (from websocket) (1.3.6)

pi@raspberrypi:~/ws $ twistd smartanthill
An error has occurred: b'ImportError: No module named websocket'
Please look at log file for more information.
pi@raspberrypi:~/ws $ smartanthill
2018-09-01T02:51:38+0300 [twisted.scripts._twistd_unix.UnixAppLogger#info] twistd 18.7.0 (/usr/bin/python 2.7.13) starting up.
2018-09-01T02:51:38+0300 [twisted.scripts._twistd_unix.UnixAppLogger#info] reactor class: twisted.internet.epollreactor.EPollReactor.
2018-09-01T02:51:38+0300 [sas]
              _________________________________________
             /                                        /\     >< An open IoT system ><
            /        \/             \\             __/ /\    Home:    http://smartanthill.org
           /   ___  _@@    Smart    @@_  ___     /  \/       Docs:    http://docs.smartanthill.org
          /   (___)(_)    Anthill    (_)(___)   /__          Issues:  https://github.com/smartanthill/smartanthill2_0/issues
         /    //|| ||      0.0.0      || ||\\     /\         License: Copyright (c) 2015, OLogN Technologies AG, GNU GPL v2.0
        /_______________________________________/ /
        \_______________________________________\/           Workspace: /home/pi/ws
         \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \           Dashboard: http://localhost:8138/

2018-09-01T02:51:39+0300 [litemq] Service has been started with options '{u'resend_max': 10, u'resend_delay': 1}'
2018-09-01T02:51:39+0300 [device] Service has been started with options '{}'
2018-09-01T02:51:39+0300 [litemq] Declared new exchange 'network' with type 'direct'
2018-09-01T02:51:39+0300 [litemq] Registered consumer with exchange=network, queue=control.in, routing_key=transport->control, ack=False
2018-09-01T02:51:39+0300 [litemq] Registered consumer with exchange=network, queue=control.out, routing_key=client->control, ack=False
2018-09-01T02:51:39+0300 [network.control] Service has been started with options 'None'
2018-09-01T02:51:39+0300 [litemq] Registered consumer with exchange=network, queue=transport.in, routing_key=routing->transport, ack=False
2018-09-01T02:51:39+0300 [litemq] Registered consumer with exchange=network, queue=transport.out, routing_key=control->transport, ack=True
2018-09-01T02:51:39+0300 [network.transport] Service has been started with options 'None'
2018-09-01T02:51:39+0300 [network] Service has been started with options '{}'
2018-09-01T02:51:39+0300 [api] Auto-loaded 'GET:device.ping' handler
2018-09-01T02:51:39+0300 [api] Auto-loaded 'GET:device.operations' handler
2018-09-01T02:51:39+0300 [api] Auto-loaded 'UPDATE:device.pinmode' handler
2018-09-01T02:51:39+0300 [api] Auto-loaded 'GET:device.digitalpin' handler
2018-09-01T02:51:39+0300 [api] Auto-loaded 'UPDATE:device.digitalpin' handler
2018-09-01T02:51:39+0300 [api] Auto-loaded 'UPDATE:device.analogreference' handler
2018-09-01T02:51:39+0300 [api] Auto-loaded 'GET:device.analogpin' handler
2018-09-01T02:51:39+0300 [api] Auto-loaded 'UPDATE:device.analogpin' handler
2018-09-01T02:51:39+0300 [stderr#error] Traceback (most recent call last):
2018-09-01T02:51:39+0300 [stderr#error]   File "/usr/local/bin/smartanthill", line 11, in <module>
2018-09-01T02:51:39+0300 [stderr#error]     sys.exit(main())
2018-09-01T02:51:39+0300 [stderr#error]   File "/usr/local/lib/python2.7/dist-packages/smartanthill/__main__.py", line 33, in main
2018-09-01T02:51:39+0300 [stderr#error]     twistd.run()
2018-09-01T02:51:39+0300 [stderr#error]   File "/usr/local/lib/python2.7/dist-packages/twisted/scripts/twistd.py", line 31, in run
2018-09-01T02:51:39+0300 [stderr#error]     app.run(runApp, ServerOptions)
2018-09-01T02:51:39+0300 [stderr#error]   File "/usr/local/lib/python2.7/dist-packages/twisted/application/app.py", line 674, in run
2018-09-01T02:51:39+0300 [stderr#error]     runApp(config)
2018-09-01T02:51:39+0300 [stderr#error]   File "/usr/local/lib/python2.7/dist-packages/twisted/scripts/twistd.py", line 25, in runApp
2018-09-01T02:51:39+0300 [stderr#error]     runner.run()
2018-09-01T02:51:39+0300 [stderr#error]   File "/usr/local/lib/python2.7/dist-packages/twisted/application/app.py", line 385, in run
2018-09-01T02:51:39+0300 [stderr#error]     self.postApplication()
2018-09-01T02:51:39+0300 [stderr#error]   File "/usr/local/lib/python2.7/dist-packages/twisted/scripts/_twistd_unix.py", line 254, in postApplication
2018-09-01T02:51:39+0300 [stderr#error]     self.startApplication(self.application)
2018-09-01T02:51:39+0300 [stderr#error]   File "/usr/local/lib/python2.7/dist-packages/twisted/scripts/_twistd_unix.py", line 453, in startApplication
2018-09-01T02:51:39+0300 [stderr#error]     app.startApplication(application, not self.config['no_save'])
2018-09-01T02:51:39+0300 [stderr#error]   File "/usr/local/lib/python2.7/dist-packages/twisted/application/app.py", line 690, in startApplication
2018-09-01T02:51:39+0300 [stderr#error]     service.IService(application).startService()
2018-09-01T02:51:39+0300 [stderr#error]   File "/usr/local/lib/python2.7/dist-packages/twisted/application/service.py", line 288, in startService
2018-09-01T02:51:39+0300 [stderr#error]     service.startService()
2018-09-01T02:51:39+0300 [stderr#error]   File "/usr/local/lib/python2.7/dist-packages/smartanthill/service.py", line 94, in startService
2018-09-01T02:51:39+0300 [stderr#error]     SAMultiService.startService(self)
2018-09-01T02:51:39+0300 [stderr#error]   File "/usr/local/lib/python2.7/dist-packages/smartanthill/service.py", line 50, in startService
2018-09-01T02:51:39+0300 [stderr#error]     MultiService.startService(self)
2018-09-01T02:51:39+0300 [stderr#error]   File "/usr/local/lib/python2.7/dist-packages/twisted/application/service.py", line 288, in startService
2018-09-01T02:51:39+0300 [stderr#error]     service.startService()
2018-09-01T02:51:39+0300 [stderr#error]   File "/usr/local/lib/python2.7/dist-packages/smartanthill/api/service.py", line 48, in startService
2018-09-01T02:51:39+0300 [stderr#error]     service = namedModule(path).makeService("api.%s" % _name, _options)
2018-09-01T02:51:39+0300 [stderr#error]   File "/usr/local/lib/python2.7/dist-packages/twisted/python/reflect.py", line 159, in namedModule
2018-09-01T02:51:39+0300 [stderr#error]     topLevel = __import__(name)
2018-09-01T02:51:39+0300 [stderr#error] ImportError: No module named websocket