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[bilenemek <question135590@xxxxxxxxxxxxxxxxxxxxx>]

New question #135590 on DOLFIN:
https://answers.launchpad.net/dolfin/+question/135590

what might be the reason of this exception at
...dist-packages/ufl/algorithms/formtransformations.py
line 45
    def expr(self, x):
        "The default is a nonlinear operator not accepting any basis functions in its children."
        # TODO: Other operators to implement particularly? Will see when errors here trigger...
        if any(isinstance(t, Argument) for t in traverse_terminals(x)):
            error("Found basis function in %s, this is an invalid expression." % repr(x))

while trying to construct this tensor-linear dirichlet poisson problem:

def sigma(v):
	d = 0.5*(grad(v)+grad(v).T)
	d2 = 0.5*inner(d,d)
	mu = atan(sqrt(d2)/b)
	return (2.0*mu*d)

w = TestFunction(V)
v = TrialFunction(V)
a = inner(sigma(v),grad(w))*dx 
L = 0.0
problem = VariationalProblem(a, L, bcs=bc)

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