Are you sure there is a mode? If there is no mode then the MODE function will return #N/A.I'm getting #N/A with that array... when I hit the Fx to look into the function, there's nothing in the second box for Number 2, not sure if that matters.
Instead of putting Hernandez the array, I entered the cell where Hernandez is B89 so the array looks like this...
=MODE(IF(B$2:B$77=$B89,IF(C$2:C$77="W",K$2:K$77)))
still getting N/A however