Hi firedrakers, I had this script working on an older version of firedrake (24th Aug), but when I updated today I now get the following error when I try to run it: Traceback (most recent call last): File "compressible_stratified.py", line 77, in <module> solve ( a_u_project == L_u_project , dHdu0 , solver_parameters={'ksp_rtol': 1e-14} ) File "/usr/not-backed-up/firedrake/2016-09-15/firedrake/lib/python2.7/site-packages/firedrake/solving.py", line 119, in solve _solve_varproblem(*args, **kwargs) File "/usr/not-backed-up/firedrake/2016-09-15/firedrake/lib/python2.7/site-packages/firedrake/solving.py", line 147, in _solve_varproblem solver.solve() File "/usr/not-backed-up/firedrake/2016-09-15/firedrake/lib/python2.7/site-packages/firedrake/variational_solver.py", line 198, in solve self.snes.solve(None, v) File "PETSc/SNES.pyx", line 537, in petsc4py.PETSc.SNES.solve (src/petsc4py.PETSc.c:170168) File "PETSc/petscsnes.pxi", line 261, in petsc4py.PETSc.SNES_Function (src/petsc4py.PETSc.c:33322) File "/usr/not-backed-up/firedrake/2016-09-15/firedrake/lib/python2.7/site-packages/firedrake/solving_utils.py", line 216, in form_function form_compiler_parameters=problem.form_compiler_parameters) File "/usr/not-backed-up/firedrake/2016-09-15/firedrake/lib/python2.7/site-packages/firedrake/assemble.py", line 81, in assemble inverse=inverse, mat_type=mat_type, appctx=appctx) File "<decorator-gen-295>", line 2, in _assemble File "/usr/not-backed-up/firedrake/2016-09-15/firedrake/lib/python2.7/site-packages/firedrake/utils.py", line 62, in wrapper return f(*args, **kwargs) File "/usr/not-backed-up/firedrake/2016-09-15/firedrake/lib/python2.7/site-packages/firedrake/assemble.py", line 444, in _assemble return thunk(bcs) File "/usr/not-backed-up/firedrake/2016-09-15/firedrake/lib/python2.7/site-packages/firedrake/assembly_cache.py", line 357, in inner r = thunk(bcs) File "/usr/not-backed-up/firedrake/2016-09-15/firedrake/lib/python2.7/site-packages/firedrake/assemble.py", line 394, in thunk op2.par_loop(*args, **kwargs) File "<decorator-gen-269>", line 2, in par_loop File "/usr/not-backed-up/firedrake/2016-09-15/firedrake/lib/python2.7/site-packages/pyop2/versioning.py", line 154, in modifies_arguments retval = func(*args, **kwargs) File "/usr/not-backed-up/firedrake/2016-09-15/firedrake/lib/python2.7/site-packages/pyop2/op2.py", line 269, in par_loop return backends._BackendSelector._backend.par_loop(kernel, iterset, *args, **kwargs) File "/usr/not-backed-up/firedrake/2016-09-15/firedrake/lib/python2.7/site-packages/pyop2/base.py", line 4369, in par_loop return _make_object('ParLoop', kernel, it_space, *args, **kwargs).enqueue() File "/usr/not-backed-up/firedrake/2016-09-15/firedrake/lib/python2.7/site-packages/pyop2/backends.py", line 72, in _make_object return _BackendSelector._backend.__dict__[obj](*args, **kwargs) File "<decorator-gen-262>", line 2, in __init__ File "/usr/not-backed-up/firedrake/2016-09-15/firedrake/lib/python2.7/site-packages/pyop2/utils.py", line 130, in wrapper return f(*args, **kwargs) File "/usr/not-backed-up/firedrake/2016-09-15/firedrake/lib/python2.7/site-packages/pyop2/base.py", line 3999, in __init__ fundecl = kernel._attached_info['fundecl'] TypeError: 'bool' object has no attribute '__getitem__' What needs to be changed to get it to compile again? Thanks Will