Someone else is trying to solve the same problem in FEniCSx so perhaps you can learn from them at How to debug the PETSC ERROR?. I may be solving coupled potential and concentration problem at the turn of the year. Good luck.
Someone else is trying to solve the same problem in FEniCSx so perhaps you can learn from them at How to debug the PETSC ERROR?. I may be solving coupled potential and concentration problem at the turn of the year. Good luck.