Word press supoort told us this recording your answer:
We can’t directly rename the folders, but if your theme support can get you the updated theme in a zip file, we can delete the original citybook folder and then you can upload it to there. That should preserve the customizations that are already in place for you
Because citybook folder on your site is error, so I can’t delete it for upload new theme, that is reason why I have to rename it to citybook108.
And new theme version, you can download from https://themeforest.net/downloads