How to solve the problem with "Unable to create converter for class"?

Question

Java

Good day!
I am newbie. I am writing a simple weather forecast application for Android. Faced one problem. I'm making a request to openweathermap using Retrofit. I used this article:
https://proft.me/2017/05/5/poluchenie-prognoza-pog... .
The problem is this error: Unable to create converter for class. Googling it, I found a couple of articles on how to fix the error, but it never disappeared.
I ask for help in solving this problem, because. I've already broken my head.
My project: https://github.com/ZoRaToS/TestWeatherForecast.git
The launch happens when the Get button is pressed.

Answer 1

Good afternoon!
Here is a similar problem that has already been answered:
https://stackoverflow.com/questions/32367469/unabl...