I am encountering this error and need to address it in about 20mins: ERROR! Unexpected Exception, this is probably a bug: No module named six

Here’s the quick answer (I will revise):

pip install ansible==2.3.2.0

or use brew:

brew switch ansible 2.3.2.0

Related:

https://discourse.roots.io/t/updated-to-ansible-2-4-deploys-broken-now-what/10588?source_topic_id=5990