I just ran into this little bug: I had defined a new logbook in my config file and suddenly got the message Attribute "Date" not allowed. While I did have several attributes starting with the word "Date" (e.g. "Date In Service", "Date Retired") I had no attribute "Date" in there. After some pondering and wildly commenting out lines, it finally dawned on me: I had used an attribute "ID" - which is also not allowed. However, it would be very helpful if the error message actually reflected that...