There must be something off with the initialization. I suggest you retry the step explained in the post.
The file should have been created when doing preview
Don't forget to pass a cv_path in the argument. I guess this is the directory of your cv folder ?
Otherwise, you'll need to provide us with a reproductible example to help us help you. We can't guess what is wrong on your side. Thanks !
There also may be an issue in the package. If so, open an Issue in the package repository