Dear Smail, It looks like your installation may have failed. Can you please provide the file firedrake-install.log which will have been generated in the directory where you ran the install script. Regards, David Sent from my iPhone On 22 Dec 2019, at 18:18, Smail Merabet <merabetsmail@gmail.com> wrote:  Dear firedrake users, I am trying to test the installation, but I get the following error message (base) MacBook-Pro-de-Merabet:~ merabet$ unset PETSC_DIR (base) MacBook-Pro-de-Merabet:~ merabet$ unset PETSC_ARCH (base) MacBook-Pro-de-Merabet:~ merabet$ source /Users/merabet/firedrake/bin/activate (firedrake) (base) MacBook-Pro-de-Merabet:~ merabet$ cd Desktop/Firedrake/ (firedrake) (base) MacBook-Pro-de-Merabet:Firedrake merabet$ python helmholtz.py Traceback (most recent call last): File "helmholtz.py", line 51, in <module> from firedrake import * File "/Users/merabet/firedrake/src/firedrake/firedrake/__init__.py", line 19, in <module> import firedrake.petsc as petsc File "/Users/merabet/firedrake/src/firedrake/firedrake/petsc.py", line 4, in <module> petsc4py.init(sys.argv) File "/Users/merabet/firedrake/lib/python3.7/site-packages/petsc4py/__init__.py", line 42, in init PETSc = petsc4py.lib.ImportPETSc(arch) File "/Users/merabet/firedrake/lib/python3.7/site-packages/petsc4py/lib/__init__.py", line 29, in ImportPETSc return Import('petsc4py', 'PETSc', path, arch) File "/Users/merabet/firedrake/lib/python3.7/site-packages/petsc4py/lib/__init__.py", line 73, in Import module = import_module(pkg, name, path, arch) File "/Users/merabet/firedrake/lib/python3.7/site-packages/petsc4py/lib/__init__.py", line 58, in import_module with f: return imp.load_module(fullname, f, fn, info) File "/Users/merabet/opt/anaconda3/lib/python3.7/imp.py", line 242, in load_module return load_dynamic(name, filename, file) File "/Users/merabet/opt/anaconda3/lib/python3.7/imp.py", line 342, in load_dynamic return _load(spec) ImportError: dlopen(/Users/merabet/firedrake/lib/python3.7/site-packages/petsc4py/lib/default/PETSc.cpython-37m-darwin.so<http://petsc.cpython-37m-darwin.so/>, 2): Library not loaded: @rpath/libmpi.12.dylib Referenced from: /Users/merabet/firedrake/lib/python3.7/site-packages/petsc4py/lib/default/PETSc.cpython-37m-darwin.so<http://petsc.cpython-37m-darwin.so/> Reason: image not found (firedrake) (base) MacBook-Pro-de-Merabet:Firedrake merabet$ Thanks _______________________________________________ firedrake mailing list firedrake@imperial.ac.uk https://mailman.ic.ac.uk/mailman/listinfo/firedrake