[Solved] Preview won't load

I dunno what I did wrong to not make it load

I’ve made a game already using a similar save system so it can’t be that

I’ve also already made a game with over 12 scenes so it probably isn’t that (this game just has 4 scenes)

Any help? I really want to work on it today

EDIT: as it turns out there was something in a scene that was made it not work so I just deleted the scene and remade it from scratch. I still dunno what caused it.