Calculate sensitivity equation of reaction-diffusion systems with dolfinx

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another question, do i have to do like this from your code?? Calculate sensitivity when the control is a fem function - #3 by dokken

class Problem():
    def __init__(self, V, bcs, u_obs):
        """Initialize all variational forms for the given problem, for a given set of boundary conditions and observed u"""
        # Residual of the variational form of Poisson problem
        self.f = fem.Function(V)  # The forcing f is the design variable
        self.u = fem.Function(V)
        R = inner(grad(self.u), grad(v))*dx - inner(self.f, v)*dx

because when i did this

self._A.mult(self._u1[i].vector, self._wrk_comp.vector)

it said

NameError: name 'self' is not defined