ImportError: No module named 'yowsup'

[MarvinMedia]

I do not know what the mistake is?
Need help: D

./startservice.sh

Traceback (most recent call last):
  File "/usr/local/bin/nameko", line 11, in <module>
    sys.exit(main())
  File "/usr/local/lib/python3.5/dist-packages/nameko/cli/main.py", line 66, in main
    args.main(args)
  File "/usr/local/lib/python3.5/dist-packages/nameko/cli/commands.py", line 85, in main
    main(args)
  File "/usr/local/lib/python3.5/dist-packages/nameko/cli/run.py", line 179, in main
    import_service(path)
  File "/usr/local/lib/python3.5/dist-packages/nameko/cli/run.py", line 46, in import_service
    __import__(module_name)
  File "./service.py", line 5, in <module>
    from src.yowsupextension import YowsupExtension
  File "./src/yowsupextension.py", line 7, in <module>
    from yowsup.layers.network import YowNetworkLayer
ImportError: No module named 'yowsup'

[gabriel-tandil]

install dependencies as descrived on readme file