possible solution found here:

I think the problem is causing due to another module named as account_pain. If you look at this module, in file account_payment_view.xml you can see that this module is replacing the same button with string "Make Payment". SO if you have already installed the module account_pain, and if you try to install account_banking_payment_export, it will cause error because the button "Make Payment" is replaced in the module account_pain and is not currently in the view. So i would recommend to uninstall account_pain module or change the account_pain module to make the button invisible instead of replacing the button.