Two Nightblade Archetypes appear to be missing from PCGen, looking at the code in pcgen/data/pathfinder/ascension_games/path_of_shadow/pos_abilities_class.lst
It appears that both missing archetypes are set under the Dark Conjuror KEY instead of their own. Other data may be misrepresented for the archetypes in those lines as well.
Shadowstriker - Line 471
Shadow Agent - Line 472