Retrofit 2.0: Unable to create call adapter for class

This issue can also occur if you are using kotlin coroutines and the function is not suspend function

public interface ArticlesAPI {
 @GET("url.../habits/progress/")
    suspend fun getHabitsTasks(): BaseResponse<HabitResModel>
}

Accordingly to the code you posted you have to change from

List<ArticleResource> getArticles();

Call<List<ArticleResource>> getArticles();

You might also want to call explicitly addConverterFactory to set the converter you want to use

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