Hi Florian,

This means that at some point you have built NumPy 1.9 as a dependency
for either PyOP2, Firedrake or petsc4py and the built petsc4py against
NumPy 1.9. However now you seem to be using the system NumPy 1.7.

Remove NumPy 1.9 and rebuild petsc4py.

how can I delete numpy 1.9, or even find out where it is installed? Strangely, I seem to have 1.8.0 installed:

eikemueller@138-38-188-207 $ python
Python 2.7.8 (default, Jul 13 2014, 17:11:32)
[GCC 4.2.1 Compatible Apple LLVM 5.1 (clang-503.0.40)] on darwin
Type "help", "copyright", "credits" or "license" for more information.

>>> import numpy
>>> print numpy.__version__
1.8.0

Also, why does it only crash in the firedrake-clean script, but works without any problems when I load firedrake or petsc4py?

Thanks,

Eike