Traceback (most recent call last):


 "/home/mmundt/devel-pyomo/pyomo/pyomo/solvers/tests/checks/test_writers.py", line 72, in writer_test

load_solutions)


 "/home/mmundt/devel-pyomo/pyomo/pyomo/solvers/tests/models/base.py", line 126, in solve

**io_options)


 "/home/mmundt/devel-pyomo/pyomo/pyomo/opt/base/solvers.py", line 600, in solve

"Solver (%s) did not exit normally" % self.name)
pyutilib.common._exceptions.ApplicationError: Solver (cbc) did not exit normally

Traceback (most recent call last):


 "/Users/eborgstrom/.pex/pip.pex/6bd62cbe8c9f1ae82b35f976967538908799cbd6/.bootstrap/pex/pex.py", line 401, in execute

exit_code = self._wrap_coverage(self._wrap_profiling, self._execute)


 "/Users/eborgstrom/.pex/pip.pex/6bd62cbe8c9f1ae82b35f976967538908799cbd6/.bootstrap/pex/pex.py", line 333, in _wrap_coverage

return runner(*args)


 "/Users/eborgstrom/.pex/pip.pex/6bd62cbe8c9f1ae82b35f976967538908799cbd6/.bootstrap/pex/pex.py", line 364, in _wrap_profiling

return runner(*args)


 "/Users/eborgstrom/.pex/pip.pex/6bd62cbe8c9f1ae82b35f976967538908799cbd6/.bootstrap/pex/pex.py", line 452, in _execute

return self.execute_entry(self._pex_info.entry_point)


 "/Users/eborgstrom/.pex/pip.pex/6bd62cbe8c9f1ae82b35f976967538908799cbd6/.bootstrap/pex/pex.py", line 549, in execute_entry

return runner(entry_point)


 "/Users/eborgstrom/.pex/pip.pex/6bd62cbe8c9f1ae82b35f976967538908799cbd6/.bootstrap/pex/pex.py", line 553, in execute_module

cls.demote_bootstrap()


 "/Users/eborgstrom/.pex/pip.pex/6bd62cbe8c9f1ae82b35f976967538908799cbd6/.bootstrap/pex/pex.py", line 474, in demote_bootstrap

for module in bootstrap.demote():


 "/Users/eborgstrom/.pex/pip.pex/6bd62cbe8c9f1ae82b35f976967538908799cbd6/.bootstrap/pex/bootstrap.py", line 42, in demote

import sys
# Grab a hold of `sys` early since we'll be un-importing our module in this process.


 "/Users/eborgstrom/scratch/pex-repro/venv/lib/python2.7/site-packages/_virtualenv.py", line 97, in find_module

if fullname in _DISTUTILS_PATCH:
TypeError: argument of type 'NoneType' is not iterable
