Hi Lawrence, I pulled your PyOP2 branch with logging support and updated by firedrake modules+dependencies (ffc, ufl, coffee, fiat - all master), and I get the following when I try to run firedrake-clean: eikemueller@Eikes-MacBook-Pro $ ./scripts/firedrake-clean Traceback (most recent call last): File "./scripts/firedrake-clean", line 3, in <module> from firedrake.ffc_interface import clear_cache, FFCKernel File "/Users/eikemueller/PostDocBath/EllipticSolvers/firedrake/firedrake/__init__.py", line 31, in <module> from pyop2.logger import set_log_level, info_red, info_green, info_blue, log # noqa File "/Users/eikemueller/PostDocBath/EllipticSolvers/PyOP2/pyop2/__init__.py", line 13, in <module> from op2 import * File "/Users/eikemueller/PostDocBath/EllipticSolvers/PyOP2/pyop2/op2.py", line 39, in <module> import base File "/Users/eikemueller/PostDocBath/EllipticSolvers/PyOP2/pyop2/base.py", line 60, in <module> from coffee.visitors import FindInstances, EstimateFlops ImportError: No module named visitors To me it looks like PyOP2 tries to import a non-existant coffee module, but that’s weird, since there is a subdirectory coffee/visitors in my COFFEE installation, and the __init__.py contains: eikemueller@Eikes-MacBook-Pro $ cat __init__.py from __future__ import absolute_import from coffee.visitors.utilities import * from coffee.visitors.inspectors import * and FindInstances is defined in inspectors.py eikemueller@Eikes-MacBook-Pro $ grep FindInstances *py inspectors.py: "SymbolDeclarations", "FindInstances"] inspectors.py:class FindInstances(Visitor): inspectors.py: super(FindInstances, self).__init__() Thanks, Eike -- Dr Eike Hermann Mueller Lecturer in Scientific Computing Department of Mathematical Sciences University of Bath Bath BA2 7AY, United Kingdom +44 1225 38 6470 e.mueller@bath.ac.uk<mailto:e.mueller@bath.ac.uk> http://people.bath.ac.uk/em459/