pod install error>>> Unable to determine the platform for the `SocketSwift` target

pod install gets the error.

Podfile is:
# Uncomment the next line to define a global platform for your project
# platform :ios, '9.0'

source 'https://github.com/CocoaPods/Specs.git'
target 'SocketSwift' do

  # Pods for SocketSwift
  pod 'Socket.swift', '~> 2.4.0'
end

Code is unmodified Socket.swift

Full screen shot on Stackoverflow:
