Hey! Sorry for the late response. Errors like this appear when the primary JS data object doesn't load correctly. I'll have to review the file-deleting code and figure out why this happened.
If you can, reset the data in settings (Settings --> Other --> Reset Data). This should fix the issue. If it doesn't, use the web version for now.
Thanks for bringing this to my attention! I'll fix this as soon as possible so this doesn't happen to anyone else.