APPLICATION ERROR #200 while setup mailbox settings

[bolshi]

Hello,
I got the the following message while setting up the Mailbox settings in Email reporting:

APPLICATION ERROR #200
A required parameter to this page (mailbox_project) was not found.

At the moment seems I have to fill out that field:

Select a project (N/A if above is set to "yes")

But there's no option. The drop down is empty.

Do I have to define it before?

There are different types for authentication: APOP, LOGIN, PLAIN and USER. Which Authentication method do I choose for IMAP account?

kind regards, bolshi