So, I started looking into it and it seems like it's a pretty common issue when using Bluestacks. Apparently, it has something to do with the way the emulator interacts with your computer's hardware. Yeah, I know, it sounds super technical, but basically, it just means that Bluestacks can't access some device or file that it needs to run smoothly.
I tried a few things to fix it, like restarting Bluestacks, updating my graphics drivers, and even reinstalling the whole thing. And, guess what? It worked! Well, kind of... now I have to deal with some other issues, but at least the error is gone.