Traceback (most recent call last):
  File "test3.py", line 8, in <module>
    r = S.minimize(f, startPoint, solver='interalg', fTol = 0.000000001, constraints = cons, iprint = -1)
  File "/usr/local/lib/python2.6/dist-packages/FuncDesigner-0.37-py2.6.egg/FuncDesigner/ooSystem.py", line 91, in minimize
    return self._solve(*args, **kwargs)
  File "/usr/local/lib/python2.6/dist-packages/FuncDesigner-0.37-py2.6.egg/FuncDesigner/ooSystem.py", line 192, in _solve
    return p.solve() if kwargs.get('manage', False) in (False, 0) else p.manage()
  File "/usr/local/lib/python2.6/dist-packages/openopt-0.37-py2.6.egg/openopt/kernel/baseProblem.py", line 235, in solve
    return runProbSolver(self, *args, **kwargs)
  File "/usr/local/lib/python2.6/dist-packages/openopt-0.37-py2.6.egg/openopt/kernel/runProbSolver.py", line 122, in runProbSolver
    p._Prepare()
  File "/usr/local/lib/python2.6/dist-packages/openopt-0.37-py2.6.egg/openopt/kernel/baseProblem.py", line 707, in _Prepare
    baseProblem._prepare(self)
  File "/usr/local/lib/python2.6/dist-packages/openopt-0.37-py2.6.egg/openopt/kernel/baseProblem.py", line 408, in _prepare
    self.err('The type ' + str(type(c)) + ' is inappropriate for problem constraints')
  File "/usr/local/lib/python2.6/dist-packages/openopt-0.37-py2.6.egg/openopt/kernel/oologfcn.py", line 16, in ooerr
    raise OpenOptException(msg)
oologfcn.OpenOptException: The type <type 'NoneType'> is inappropriate for problem constraints