[SOLVED] Unable to create or start backup

[Preference]

Trying to create and start a backup trough the GUI gives me the following error:

Parameter verification failed. (400)

mailto: invalid format - undefined format 'email-or-username-list'

This worked in January and I have not made any changes regarding the backups. Version: Virtual Environment 6.2-11

 

[Preference]

apt get update

and

apt get upgrade

solved it.