Dropbox backup ERPNext 13

1

I have erpnext 13 and ubuntu 20.4 . When I am trying to take backup I get this error
File “/home/frappe/frappe-bench/apps/frappe/frappe/integrations/doctype/dropbox_settings/dropbox_settings.py”, line 57, in take_backup_to_dropbox
did_not_upload, error_log = backup_to_dropbox(upload_db_backup)

image
image1366×768 118 KB

please help me !!!

2

Thank you , solved
There were a problem in defining my email (gmail account) . and should clear cache