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iOS Build a Weather App with Swift Interacting with Data From the Web Constructing a URL

I really can't see what's wrong here. Could it be that that the string portion of the courseURL has to be converted?

How would I fix this? Should I convert treehouseCourseID from int to string somehow in the courseURL declaration?

urls.swift
import Foundation

let treehouseCourseID = 25

// Add your code below

let treehouseBaseURL = NSURL(string : "https://api.teamtreehouse.com/")
let courseURL = NSURL( string: treehouseCourseID, relativeToURL: treehouseBaseURL)