  Following the verification of the conjecture made by Comtet, Bandrauk and
Campbell that the supersymmetry-inspired semiclassical method known as SWKB is
exact for the conventional additive shape invariant potentials, it was widely
believed that SWKB yields exact results for all additive shape invariant
potentials. In this paper we present a concrete example of an additive shape
invariant potential for which the SWKB method fails to produce exact results.
