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It seems as if one of the created datastores can no longer be found or has been removed from the vcenter.
You could try and remove that datastore from the database but I would suggest creating a ticket with VMware.
Your other option (if this is a fresh install and you only have a few appstacks) would be to reinstall the manager and recreate the database. If you connect to the exact same datastores where the applications and writables are stored you can import them automatically. Only thing you need to do again is assign the packkages/appstacks again.