Hi #Fenics!
I encounter the error below when trying to use Fenics on Ubuntu 18.04. Would anyone know what the issue is?
Python 3.6.8 (default, Oct 7 2019, 12:59:55)
[GCC 8.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import fenics
>>> mesh = fenics.UnitSquareMesh(5, 5)
>>> fenics.FunctionSpace(mesh, 'P', 1)
Calling FFC just-in-time (JIT) compiler, this may take some time.
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/dolfin/compilemodules/jit.py", line 142, in jit
result = ffc.jit(ufl_object, parameters=p)
File "/usr/lib/python3/dist-packages/ffc/jitcompiler.py", line 218, in jit
module = jit_build(ufl_object, module_name, parameters)
File "/usr/lib/python3/dist-packages/ffc/jitcompiler.py", line 134, in jit_build
generate=jit_generate)
File "/usr/lib/python3/dist-packages/dijitso/jit.py", line 167, in jit
header, source, dependencies = generate(jitable, name, signature, params["generator"])
File "/usr/lib/python3/dist-packages/ffc/jitcompiler.py", line 67, in jit_generate
prefix=module_name, parameters=parameters, jit=True)
File "/usr/lib/python3/dist-packages/ffc/compiler.py", line 150, in compile_element
prefix, parameters, jit)
File "/usr/lib/python3/dist-packages/ffc/compiler.py", line 190, in compile_ufl_objects
ir = compute_ir(analysis, prefix, parameters, jit)
File "/usr/lib/python3/dist-packages/ffc/representation.py", line 171, in compute_ir
for e in elements]
File "/usr/lib/python3/dist-packages/ffc/representation.py", line 171, in <listcomp>
for e in elements]
File "/usr/lib/python3/dist-packages/ffc/representation.py", line 203, in _compute_element_ir
fiat_element = create_element(ufl_element)
File "/usr/lib/python3/dist-packages/ffc/fiatinterface.py", line 99, in create_element
element = _create_fiat_element(ufl_element)
File "/usr/lib/python3/dist-packages/ffc/fiatinterface.py", line 196, in _create_fiat_element
element = ElementClass(fiat_cell, degree)
File "/usr/lib/python3/dist-packages/FIAT/lagrange.py", line 56, in __init__
poly_set = polynomial_set.ONPolynomialSet(ref_el, degree)
File "/usr/lib/python3/dist-packages/FIAT/polynomial_set.py", line 176, in __init__
dv = expansion_set.tabulate_derivatives(degree, pts)
File "/usr/lib/python3/dist-packages/FIAT/expansions.py", line 262, in tabulate_derivatives
data = _tabulate_dpts(self._tabulate, 2, n, order, numpy.array(pts))
File "/usr/lib/python3/dist-packages/FIAT/expansions.py", line 104, in _tabulate_dpts
phi.append(form_derivative(phi[-1]))
File "/usr/lib/python3/dist-packages/FIAT/expansions.py", line 50, in form_derivative
out = [sympy.diff(F, X[j]) for j in range(D)]
File "/usr/lib/python3/dist-packages/FIAT/expansions.py", line 50, in <listcomp>
out = [sympy.diff(F, X[j]) for j in range(D)]
File "/usr/local/lib/python3.6/dist-packages/sympy/core/function.py", line 2314, in diff
return Derivative(f, *symbols, **kwargs)
File "/usr/local/lib/python3.6/dist-packages/sympy/core/function.py", line 1198, in __new__
it cannot be differentiated.''' % expr))
ValueError:
Since there are no variables in the expression [0, 0], it cannot be
differentiated.
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python3/dist-packages/dolfin/functions/functionspace.py", line 199, in __init__
self._init_convenience(*args, **kwargs)
File "/usr/lib/python3/dist-packages/dolfin/functions/functionspace.py", line 249, in _init_convenience
constrained_domain=constrained_domain)
File "/usr/lib/python3/dist-packages/dolfin/functions/functionspace.py", line 218, in _init_from_ufl
dolfin_element, dolfin_dofmap = _compile_dolfin_element(element, mesh, constrained_domain=constrained_domain)
File "/usr/lib/python3/dist-packages/dolfin/functions/functionspace.py", line 82, in _compile_dolfin_element
ufc_element, ufc_dofmap = jit(element, mpi_comm=mesh.mpi_comm())
File "/usr/lib/python3/dist-packages/dolfin/compilemodules/jit.py", line 70, in mpi_jit
return local_jit(*args, **kwargs)
File "/usr/lib/python3/dist-packages/dolfin/compilemodules/jit.py", line 147, in jit
"ffc.jit failed with message:\n%s" % (tb_text,))
File "/usr/lib/python3/dist-packages/dolfin/cpp/common.py", line 2044, in dolfin_error
return _common.dolfin_error(location, task, reason)
RuntimeError:
*** -------------------------------------------------------------------------
*** DOLFIN encountered an error. If you are not able to resolve this issue
*** using the information listed below, you can ask for help at
***
*** fenics-support@googlegroups.com
***
*** Remember to include the error message listed below and, if possible,
*** include a *minimal* running example to reproduce the error.
***
*** -------------------------------------------------------------------------
*** Error: Unable to perform just-in-time compilation of form.
*** Reason: ffc.jit failed with message:
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/dolfin/compilemodules/jit.py", line 142, in jit
result = ffc.jit(ufl_object, parameters=p)
File "/usr/lib/python3/dist-packages/ffc/jitcompiler.py", line 218, in jit
module = jit_build(ufl_object, module_name, parameters)
File "/usr/lib/python3/dist-packages/ffc/jitcompiler.py", line 134, in jit_build
generate=jit_generate)
File "/usr/lib/python3/dist-packages/dijitso/jit.py", line 167, in jit
header, source, dependencies = generate(jitable, name, signature, params["generator"])
File "/usr/lib/python3/dist-packages/ffc/jitcompiler.py", line 67, in jit_generate
prefix=module_name, parameters=parameters, jit=True)
File "/usr/lib/python3/dist-packages/ffc/compiler.py", line 150, in compile_element
prefix, parameters, jit)
File "/usr/lib/python3/dist-packages/ffc/compiler.py", line 190, in compile_ufl_objects
ir = compute_ir(analysis, prefix, parameters, jit)
File "/usr/lib/python3/dist-packages/ffc/representation.py", line 171, in compute_ir
for e in elements]
File "/usr/lib/python3/dist-packages/ffc/representation.py", line 171, in <listcomp>
for e in elements]
File "/usr/lib/python3/dist-packages/ffc/representation.py", line 203, in _compute_element_ir
fiat_element = create_element(ufl_element)
File "/usr/lib/python3/dist-packages/ffc/fiatinterface.py", line 99, in create_element
element = _create_fiat_element(ufl_element)
File "/usr/lib/python3/dist-packages/ffc/fiatinterface.py", line 196, in _create_fiat_element
element = ElementClass(fiat_cell, degree)
File "/usr/lib/python3/dist-packages/FIAT/lagrange.py", line 56, in __init__
poly_set = polynomial_set.ONPolynomialSet(ref_el, degree)
File "/usr/lib/python3/dist-packages/FIAT/polynomial_set.py", line 176, in __init__
dv = expansion_set.tabulate_derivatives(degree, pts)
File "/usr/lib/python3/dist-packages/FIAT/expansions.py", line 262, in tabulate_derivatives
data = _tabulate_dpts(self._tabulate, 2, n, order, numpy.array(pts))
File "/usr/lib/python3/dist-packages/FIAT/expansions.py", line 104, in _tabulate_dpts
phi.append(form_derivative(phi[-1]))
File "/usr/lib/python3/dist-packages/FIAT/expansions.py", line 50, in form_derivative
out = [sympy.diff(F, X[j]) for j in range(D)]
File "/usr/lib/python3/dist-packages/FIAT/expansions.py", line 50, in <listcomp>
out = [sympy.diff(F, X[j]) for j in range(D)]
File "/usr/local/lib/python3.6/dist-packages/sympy/core/function.py", line 2314, in diff
return Derivative(f, *symbols, **kwargs)
File "/usr/local/lib/python3.6/dist-packages/sympy/core/function.py", line 1198, in __new__
it cannot be differentiated.''' 6.909194e-310xpr))
ValueError:
Since there are no variables in the expression [0, 0], it cannot be
differentiated.
.
*** Where: This error was encountered inside jit.py.
*** Process: 0
***
*** DOLFIN version: 2017.2.0
*** Git changeset: unknown
*** -------------------------------------------------------------------------
As far as I know, fenics was installed by apt install python3-dolfin. The linux distribution is the following:
Linux macomp001 4.15.0-66-generic #75-Ubuntu SMP Tue Oct 1 05:24:09 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux