  We correct what amounts to a sign error in the proof of part (i.) of theorem
3 in Class.Quant.Grav.28 225003 (arXiv:1107.0709). The Plebanski sectors
isolated by the linear simplicity constraints do not change --- they are still
the three sectors (deg), (II+), and (II-). What changes is the characterization
of the continuum Plebanski two-form corresponding to the first two terms in the
asymptotics of the EPRL vertex amplitude for Regge-like boundary data. These
two terms do not correspond to Plebanski sectors (II+) and (II-), but rather to
the two possible signs of the product of the sign of the sector --- +1 for
(II+) and -1 for (II-) --- and the sign of the orientation
$\epsilon_{IJKL}B^{IJ} \wedge B^{KL}$ determined by $B^{IJ}$. This is
consistent with what one would expect, as this is exactly the sign which
classically relates the BF action, in Plebanski sectors (II+) and (II-), to the
Einstein-Hilbert action, whose discretization is the Regge action appearing in
the asymptotics.
