I'm using the latest PX version, and I get this error when I pick any px scheme that contains Wings. The game doesn't crash offline, so I so don't get the errorlog text. If I tried to play a scheme with a Wings, none of Step's weapons load, and I just see regular weapons. I tested it out myself on a scheme with all of Step's weapons except Wings, and px weapons loads just fine. It's also playable online. Funny thing is that Step's wing worked well on my cpu before he also added end animation for that mobility tool. Just look at the image for the px_errors as it shows exactly same thing as what it is shown in that picture above, and I've attached pxlog file which may give more clues to solve this problem.
[Sorry move this topic to Step's Weapons.]