[2019/11/12 18:08:36.911] Running command 'shell.exec' in "run tests" (step 2.2 of 2)
[2019/11/12 18:08:37.052] Traceback (most recent call last):
[2019/11/12 18:08:37.052] File "/usr/bin/virtualenv", line 6, in <module>
[2019/11/12 18:08:37.052] from pkg_resources import load_entry_point
[2019/11/12 18:08:37.052] File "/usr/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 3251, in <module>
[2019/11/12 18:08:37.053] @_call_aside
[2019/11/12 18:08:37.053] File "/usr/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 3235, in _call_aside
[2019/11/12 18:08:37.053] f(*args, **kwargs)
[2019/11/12 18:08:37.053] File "/usr/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 3264, in _initialize_master_working_set
[2019/11/12 18:08:37.053] working_set = WorkingSet._build_master()
[2019/11/12 18:08:37.053] File "/usr/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 585, in _build_master
[2019/11/12 18:08:37.053] return cls._build_from_requirements(__requires__)
[2019/11/12 18:08:37.053] File "/usr/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 598, in _build_from_requirements
[2019/11/12 18:08:37.053] dists = ws.resolve(reqs, Environment())
[2019/11/12 18:08:37.053] File "/usr/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 786, in resolve
[2019/11/12 18:08:37.054] raise DistributionNotFound(req, requirers)
[2019/11/12 18:08:37.054] pkg_resources.DistributionNotFound: The 'virtualenv==15.1.0' distribution was not found and is required by the application
[2019/11/12 18:08:37.062] Command failed: command encountered problem: exit status 1
[2019/11/12 18:08:37.062] Task completed - FAILURE.