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iOS Build a Weather App with Swift Managing Complexity Callback Methods With Closures

The code works in Playground, but not in Task screen

Why does the code attached work in Playground, but not in the task screen ?

Callbacks.swift
import Foundation

// Add your code below
typealias BlogPostCompletion = (NSData!, NSURLResponse!, NSError!) -> Void

func fetchTreehouseBlogPosts(completion: BlogPostCompletion) {
}