appium_lib won't load

env.rb

require 'lapis_lazuli'
require 'lapis_lazuli/cucumber'


LapisLazuli::WorldModule::Config.config_file = "config/config.yml"
World(LapisLazuli)
 
 
class AppiumWorld
end
 
require 'rubygems'
require 'appium_lib'


this_dir = File.expand_path(File.dirname(__FILE__))
puts this_dir

APP_PATH = './chatbeta.apk'

desired_caps = {
    caps: {
        platformName: 'Android',
        deviceName: '',
        app: APP_PATH,
    },
    appium_lib: {
        port: 4723,
    }
}

Appium::Driver.new(desired_caps).start_driver
Appium.promote_appium_methods AppiumWorld

World do
  AppiumWorld.new
end

Before { $driver.start_driver }
After { $driver.driver_quit }