First of all, if you are new to fenics, we strongly encourage you to use FEniCSx, Ref: The new DOLFINx solver is now recommended over DOLFIN
Your error is most likely related to permission issues with creating the folder poisson
First of all, if you are new to fenics, we strongly encourage you to use FEniCSx, Ref: The new DOLFINx solver is now recommended over DOLFIN
Your error is most likely related to permission issues with creating the folder poisson