Hi all. I am new in FeniCS. I had installed the fenics in ubuntu18.04 as mentioned in fenics documentation. I am facing this error while running one of the demo.
Thanku in advance.
Traceback (most recent call last):
File "demo_auto-adaptive_poisson.py", line 23, in <module>
from dolfin import *
File "/usr/lib/petsc/lib/python3/dist-packages/dolfin/__init__.py", line 144, in <module>
from .fem.assembling import (assemble, assemble_system, assemble_multimesh, assemble_mixed,
File "/usr/lib/petsc/lib/python3/dist-packages/dolfin/fem/assembling.py", line 38, in <module>
from ufl.form import sub_forms_by_domain
ImportError: cannot import name 'sub_forms_by_domain'