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iOS Build a Weather App with Swift (Retired) Pulling Data From the Web Creating a URL

3,940 Points

"The URL string assigned to the NSURL isn't correct - please double-check it!"

Can somebody explain what I am doing wrong here?

import Foundation

let courseID = 25
let treehouseBaseURL = NSURL(string: "api.teamtreehouse.com/\(courseID)/")