Okay, so the problem is kind of gone. Basically, as long as I don't disable and then re-enable Aric's from in game, the errors wont pop up. Since I was doing a fresh installation each time I deleted the main game folder and redownloaded it, I figured that I had to go ahead and re-enable the mod from the mod menu, close the game, and then open it again. Turns out though, I don't have to go through that effort. I noticed that the error wasn't showing up the first time I opened the game (before I disabled then re-enabled the mod). And when I was still under the assumption the mod wasn't working until I had turned it off then back on, the errors would pop up as soon as I opened the game after messing with the mod from within the game menu. But I discovered that the mod is actually working after a "fresh install". I load a save and the cmd box comes up saying Aric's Expansion v0.97, and the library entries about breeding are there (which is the easiest way for me to find out if your tweaks are working). And best of all, after acquiring Emily on a brand new save I can go ahead and distribute her attribute points-- which is why these errors were annoying me to begin with.
Either way, I am now going to never touch the mod menu from within the game ever again. Because whatever is causing this, it only happens after I've turned Aric's off and then back on.