Fix an error on the Opencart checkout page

Opencart 1.5.4.1 is available

Ordering is implemented using the Simple 4.9.7 module

I attach a screenshot with the correct design page where there is a choice of city and depending on it the methods of delivery.

But some users come across a checkout page without choosing a city, without delivery methods and with a message to contact the administration (screenshot 2).


It is necessary:

a) to understand under what conditions such a message can come out


b) correct this error.