Gemfile

source 'https://rubygems.org'

gem 'cocoapods', :git => 'https://github.com/CocoaPods/CocoaPods.git'

gistfile1.txt

bundle install

bundle exec pod install
Analyzing dependencies
Pre-downloading: `Eureka` from `https://github.com/xmartlabs/Eureka.git`, branch `Swift3`
[!] Unable to find host target(s) for MessagesExtension. Please add the host targets for the embedded targets to the Podfile.
Certain kinds of targets require a host target. A host target is a "parent" target which embeds a "child" target. These are example types of targets that need a host target:
- Framework
- App Extension
- Watch OS 1 Extension
- Messages Extension (except when used with a Messages Application)

Podfile

# Uncomment this line to define a global platform for your project
platform :ios, '10.0'

target 'MessagesExtension' do
  use_frameworks!

  pod 'Eureka', :git => 'https://github.com/xmartlabs/Eureka.git', :branch => 'Swift3'
end