  We correct some errors in the two papers published with the above title in
Class. Quant. Grav. 19 (2002). In particular, the correct prescription for
computing the probabilities is given, in that appropriate normalization factors
are introduced. The resulting computation of the semi-classical limit of
probabilities actually becomes much simpler, and no CFT analysis is necessary.
In spite of some mistakes, the conclusions of these two papers are to a large
extent unchanged. In particular, we still get an exponentially small answer
exp(-beta*M) for the black hole creation-evaporation probability.
