Problem in using Combined space in dolfin 2019.2

1

Dear sir/ ma’am
Thank you for your suggestion for my previous problems. I am expecting some help with this problem also.
i am not able to combine two spaces, which are spacious with nedlec element and Lagrange element

V_N = FunctionSpace(mesh, "Nedelec 1st kind H(curl)",1)
    V_M = FunctionSpace(mesh, "Lagrange",1)
    combined_space = V_N + V_M
    (N_v, M_v) = TestFunctions(combined_space)
    (N_u, M_u) = TrialFunctions(combined_space)
2

You should use Mixed elements:

V =FiniteElement("Nedelec 1st kind H(curl)", mesh.ufl_cell(), 1)
Q = FiniteElement("CG", mesh.ufl_cell(), 1)

a = MixedElement([V,Q])
W = FunctionSpace(mesh, a)