Update to 0.15.2 - it fixes the issues. As per Frencks instructions :
Important, v0.15.0 & v0.15.1 have an issue with failing to detect the migration that already happened.
That is unfortunate, but it did happen and didn’t show up in testing, unfortunately 
If you have upgraded from v0.14 or older to v0.15.0 or v0.15.1 you will encounter a migration problem.
To solve this:
- Restore a backup (AppDaemon + home assistant config as that is where the appdaemon config is stored)
- Clear out the AppDaemon folder in
/addon_configs/, which contains the invalid migration. You can access this folder using the terminal add-on or using theaddon_configsshare provided by the Samba add-on.
Once you are back up and running on the previous version, upgrade to v0.15.2.
I’ve addressed the issue as quickly as possible, but I cannot revert what has been done.
I’m mostly mad at myself right now, and I’m deeply sorry this happened.
Sorry for the issue this might have caused for you 
…/Frenck