Appium error 2

gistfile1.txt

/Users/justinr/.rvm/gems/ruby-2.0.0-p643/gems/selenium-webdriver-2.42.0/lib/selenium/webdriver/remote/response.rb:54:in `assert_ok': status code 500 (Selenium::WebDriver::Error::ServerError)
	from /Users/justinr/.rvm/gems/ruby-2.0.0-p643/gems/selenium-webdriver-2.42.0/lib/selenium/webdriver/remote/response.rb:15:in `initialize'
	from /Users/justinr/.rvm/gems/ruby-2.0.0-p643/gems/selenium-webdriver-2.42.0/lib/selenium/webdriver/remote/http/common.rb:59:in `new'
	from /Users/justinr/.rvm/gems/ruby-2.0.0-p643/gems/selenium-webdriver-2.42.0/lib/selenium/webdriver/remote/http/common.rb:59:in `create_response'
	from /Users/justinr/.rvm/gems/ruby-2.0.0-p643/gems/selenium-webdriver-2.42.0/lib/selenium/webdriver/remote/http/default.rb:66:in `request'
	from /Users/justinr/.rvm/gems/ruby-2.0.0-p643/gems/selenium-webdriver-2.42.0/lib/selenium/webdriver/remote/http/common.rb:40:in `call'
	from /Users/justinr/.rvm/gems/ruby-2.0.0-p643/gems/appium_lib-3.0.2/lib/appium_lib/common/patch.rb:140:in `raw_execute'
	from /Users/justinr/.rvm/gems/ruby-2.0.0-p643/gems/selenium-webdriver-2.42.0/lib/selenium/webdriver/remote/bridge.rb:99:in `create_session'
	from /Users/justinr/.rvm/gems/ruby-2.0.0-p643/gems/selenium-webdriver-2.42.0/lib/selenium/webdriver/remote/bridge.rb:68:in `initialize'
	from /Users/justinr/.rvm/gems/ruby-2.0.0-p643/gems/selenium-webdriver-2.42.0/lib/selenium/webdriver/common/driver.rb:33:in `new'
	from /Users/justinr/.rvm/gems/ruby-2.0.0-p643/gems/selenium-webdriver-2.42.0/lib/selenium/webdriver/common/driver.rb:33:in `for'
	from /Users/justinr/.rvm/gems/ruby-2.0.0-p643/gems/selenium-webdriver-2.42.0/lib/selenium/webdriver.rb:67:in `for'
	from /Users/justinr/.rvm/gems/ruby-2.0.0-p643/gems/appium_lib-3.0.2/lib/appium_lib/driver.rb:426:in `start_driver'
	from /Users/justinr/Desktop/tutorial/projects/ruby_ios/appium/run.rb:31:in `<top (required)>'
	from ./appium/run.rb:1:in `require_relative'
	from ./appium/run.rb:1:in `<main>'