I don’t know but searching for that error it might be a problem with their servers… https://forums.developer.apple.com/forums/thread/760118 https://forums.developer.apple.com/forums/thread/749634 I’m really not sure though. Let us know if it magically clears up

I tried your code and it correctly detected 2 faces in the image supplied. This is with iPad Playgrounds 4.5.1. I didn’t put the source image in a .xcassets folder though, instead I used the Add File > Photo button at the top left.