This error
w3af failed to start with the following message: Exception: "There was an error while importing w3af.plugins.output.console: "No module named darts.lib.utils.lru"."
fixed
apt-get install python-setuptools << jika error lewatin step selanjut nya git clone https://github.com/deterministic-arts/DartsPyLRU.git cd DartsPyLRU python setup.py install
reference and this