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This is due to you not setting up the notification email. To fix this, do the following:
1. Login to Plesk as admin and go to Server --> Notifications.
2. Put in your email address in the "e-mail address" field.
3. Alternatively, you can uncheck the "Notification" feature and not put in the email to get rid of this error showing.
I very seldom contact support, but if I do, the response is always prompt and issues are always resolved.
Thanks for the fast sollution, it was my fault since my original e-mail got somehow bugged and I didn't got the invoice mails.
Even though I only have a shared hosting plan, their technical support team responded to my tech support request within the hour, and correctly to boot. (I needed to have a subdomain point to a Tumblr blog by changing the CNAME.)