Try the following steps:
- Close Anki
- Go to the /Users/natilec/Library/Application Support/AnkiHub folder. The Library folder is hidden by default, but can be revealed in Finder by holding down the option key while clicking on the Go menu.
- Open each subfolder there (you should see at least one with a random name) and delete the ankihub.db file.
- Open Anki and log in to AnkiHub again.