What to do if you see the message "You have configured invalid journals" or "The selected cashbook with number ... does not exist in e-conomic"

The cause:

These messages appear when one or more journal numbers (a.k.a "cashbook"), which refers to "kassekladde" in e-conomic, are not yet filled out in the Pleo Accounting page, and so the export fails.

The solution:

In the Pleo accounting page, make sure that the specific journals are filled out for card expenses and out-of-pocket expenses (if your organisation uses Reimbursements):