I upgraded opencart from version 1.5.x to version 2.0.1.1, everything went well except that I can not edit customer orders or change the status of the order and notify
Follow the prints of what's happening to me
I have tried several solutions that I found, such as adding the API, checking in the database if the API ID is correct
Store is not in maintenance mode
I have already changed the api () function, as some suggest, but nothing works