Here was the issue:
Just to share with who might need, here is what I’ve done:
- Go to Play mode, delete all default VSTs.
- Use “+” on the bottom to create new VSTs, choose NotePerformer for all of them.
- Now you can save!
If you don’t have NotePerformer but still succeeded with another VST, sharing it here will be appreciated. I hope this helps people who have the same difficulties as me. (I almost lose my job for 10-days-late progress because of the crash but now I’m saved. That was a close one. )