No module named backports

[makramalla]

Hello, I am using the latest netopeer2gui Ubuntu vagrant image, however I am getting the following error in the backend.log after I run vagrant up:

 Traceback (most recent call last):
  File "/usr/lib/python3.5/runpy.py", line 184, in _run_module_as_main
    "__main__", mod_spec)
  File "/usr/lib/python3.5/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "backend/__main__.py", line 3, in <module>
    from liberouterapi import app, config
  File "backend/liberouterapi/__init__.py", line 27, in <module>
    from .configurator import Config
  File "backend/liberouterapi/configurator.py", line 3, in <module>
    from backports import configparser

I tried installing backports using pip install backports.weakref, however I am still getting the same error.

Let me know if you need any further information from my end.

Thanks,

Maged