Question

我尝试了以下代码

crawler = Capybara::Session.new(:selenium)
crawler.visit "https://twitter.com" # Error this line!

与

gem:
  capybara (= 2.2.0)
  selenium-webdriver (3.3.0)
WebBrowser:
  FireFoex53.0
OS:
  Mac OSX

然后得到以下错误

TypeError: can't dup NilClass

[stack trace]
gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/remote/w3c_capabilities.rb:101:in `dup'",
gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/remote/w3c_capabilities.rb:101:in `json_create'",
gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/remote/w3c_bridge.rb:116:in `create_session'",
gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/remote/w3c_bridge.rb:76:in `initialize'",
gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/firefox/w3c_bridge.rb:45:in `initialize'",
gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/common/driver.rb:52:in `new'",
gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/common/driver.rb:52:in `for'",
gems/selenium-webdriver-3.3.0/lib/selenium/webdriver.rb:87:in `for'",
gems/capybara-2.2.0/lib/capybara/selenium/driver.rb:13:in `browser'",
gems/capybara-2.2.0/lib/capybara/selenium/driver.rb:45:in `visit'",
gems/capybara-2.2.0/lib/capybara/session.rb:197:in `visit'"

当我在这个FireFox浏览器上进行手动访问时，

url“https://twitter.com”正在运行。

但是水豚的visit方法不起作用..

Answer 1

我在尝试使用selenium-webdriver gem as instructed时遇到了这个错误（ TypeError：不能复制NilClass ）：

require "selenium-webdriver"

driver = Selenium::WebDriver.for :firefox

作为suggested by Thomas，将selenium-webdriver gem编号从3.3.x更新为3.4.x可以解决问题。

Capybara + selenium驱动程序中的“TypeError：不能复制NilClass”

1 个答案: