Hey there @Cie19! Welcome to the community! It looks like that Bad Cast Node either got corrupted, or was broken if the original class is missing. First thing would be to check the original and see what class that cast is intended to be to. Then delete and replace the broken node with the class you were intending to cast to. Then for the other two nodes you’d likely be connecting whatever your cast was to originally to them.
Do you need the ARkit/Live Link setup for this character? If not, much of this could just be ripped out.
Where did you get the character itself? It seems to have been setup for Livelink/ARkit, which is a way to control facial animation through an iOS device. If you don’t need this functionality, I would just remove the nodes causing the errors entirely as otherwise you’ll need to review this documentation to learn how to use it.
If you don’t need it, you can safely remove the broken nodes entirely.