This appears in the logs.
Method: daily_long, Handler: erpnext.setup.doctype.backup_manager.backup_manager.take_backups_daily
Traceback (innermost last):
File “/home/altan/frappe-bench/apps/frappe/frappe/tasks.py”, line 90, in scheduler_task
frappe.get_attr(handler)()
File “/home/altan/frappe-bench/apps/erpnext/erpnext/setup/doctype/backup_manager/backup_manager.py”, line 39, in take_backups_daily
take_backups_if(“Daily”)
File “/home/altan/frappe-bench/apps/erpnext/erpnext/setup/doctype/backup_manager/backup_manager.py”, line 47, in take_backups_if
take_backups_dropbox()
File “/home/altan/frappe-bench/apps/erpnext/erpnext/setup/doctype/backup_manager/backup_manager.py”, line 65, in take_backups_dropbox
send_email(False, “Dropbox”, error_message)
File “/home/altan/frappe-bench/apps/erpnext/erpnext/setup/doctype/backup_manager/backup_manager.py”, line 101, in send_email
recipients = frappe.db.get_value(“Backup Manager”, None, “send_notifications_to”).split(“,”)
AttributeError: ‘NoneType’ object has no attribute ‘split’