The error message you've attached doesn't support what you wrote, it actually looks like a different problem based on that.
The "Bank specifications" are actually cheque specifications, so if you've printed cheques from AP before, they should not be missing. Your adagio consultant should be able to help you restore them from a back-up if they are gone now.
However, if you are trying to change bank details as suggested by the screenshot, then you'll have to follow the instructions and print and clear the posting journals and cheque register before you can proceed.