ImportError: No module named 'exchange'

[JafferWilson]

Could not understand why this issue has popped up? I am following your instructions for installation.
See the error:

Traceback (most recent call last):
  File "cointrol/manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/home/ubuntu/Cointrol/virtualenv/lib/python3.5/site-packages/django/core/management/__init__.py", line 364, in execute_from_command_line
    utility.execute()
  File "/home/ubuntu/Cointrol/virtualenv/lib/python3.5/site-packages/django/core/management/__init__.py", line 338, in execute
    django.setup()
  File "/home/ubuntu/Cointrol/virtualenv/lib/python3.5/site-packages/django/__init__.py", line 27, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/home/ubuntu/Cointrol/virtualenv/lib/python3.5/site-packages/django/apps/registry.py", line 85, in populate
    app_config = AppConfig.create(entry)
  File "/home/ubuntu/Cointrol/virtualenv/lib/python3.5/site-packages/django/apps/config.py", line 94, in create
    module = import_module(entry)
  File "/home/ubuntu/Cointrol/virtualenv/lib/python3.5/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 986, in _gcd_import
  File "<frozen importlib._bootstrap>", line 969, in _find_and_load
  File "<frozen importlib._bootstrap>", line 956, in _find_and_load_unlocked
ImportError: No module named 'exchange'