  We correct a mistake regarding almost complex structures on Hilbert schemes
of points in surfaces in arXiv:1510.02449. The error does not affect the main
results of the paper, and only affects the proofs of invariance of equivariant
symplectic Khovanov homology and reduced symplectic Khovanov homology. We give
an alternate proof of the invariance of equivariant symplectic Khovanov
homology.
