As the error apparently came from the Openweathermap API, as even with modules from other developers the error persisted, I chose to exchange the module for one from SP Weather, which made it possible to use a Weatherbit API. It worked perfectly. So, I started duplicating the module, changing the latitude and longitude and the display page, to reflect the weather conditions of each city and everything went very well. Until, when duplicating for the 18th time, to the city of Corbélia, the error shown in the image appeared and everything stopped working.