Help! Project seems to be corrupted

I was using Cocos Creator fine, and when I tried to run the game as usual, this error popped up:

I’m unable to build or play the project at all.

We can ask @jare to give us advice.

in previous cc versions, this happened if you remove used resources (either from editor or from the outside). if, for instance, you have a Sprite and you remove its associated image file, it will throw such exceptions at runtime. same with prefabs and audio files.

I’m guessing that was the case as I also removed some items in my assets. I worked around the problem by creating a whole new project and manually copying over everything