我正尝试按照官方的《入门指南》启动并运行量角器。

命令

webdriver-manager start

似乎运行顺利：

webdriver-manager start
seleniumProcess.pid: 22169
Apr 23, 2014 10:27:46 AM org.openqa.grid.selenium.GridLauncher main
INFO: Launching a standalone server
Setting system property webdriver.chrome.driver to /usr/local/lib/node_modules/protractor/selenium/chromedriver
10:27:46.959 INFO - Java: Apple Inc. 20.65-b04-462
10:27:46.960 INFO - OS: Mac OS X 10.8.5 x86_64
10:27:46.968 INFO - v2.41.0, with Core v2.41.0. Built from revision 3192d8a
10:27:47.021 INFO - Default driver org.openqa.selenium.ie.InternetExplorerDriver registration is skipped: registration capabilities Capabilities [{platform=WINDOWS, ensureCleanSession=true, browserName=internet explorer, version=}] does not match with current platform: MAC
10:27:47.059 INFO - RemoteWebDriver instances should connect to: <link deleted>
10:27:47.059 INFO - Version Jetty/5.1.x
10:27:47.060 INFO - Started HttpContext[/selenium-server/driver,/selenium-server/driver]
10:27:47.060 INFO - Started HttpContext[/selenium-server,/selenium-server]
10:27:47.061 INFO - Started HttpContext[/,/]
10:27:47.092 INFO - Started org.openqa.jetty.jetty.servlet.ServletHandler@4cc39a20
10:27:47.092 INFO - Started HttpContext[/wd,/wd]
10:27:47.096 INFO - Started SocketListener on 0.0.0.0:4444
10:27:47.096 INFO - Started org.openqa.jetty.jetty.Server@1d5a0305

但是，跑步

protractor /usr/local/lib/node_modules/protractor/example/conf.js

如建议导致错误：

protractor /usr/local/lib/node_modules/protractor/example/conf.js 
Using the selenium server at <link deleted>

/usr/local/lib/node_modules/protractor/node_modules/selenium-webdriver/lib/webdriver/promise.js:1702
  throw error;
        ^
UnknownError: The driver executable does not exist: /usr/local/lib/node_modules/protractor/selenium/chromedriver
at <anonymous>

并且旧窗口抛出异常：

10:30:19.106 WARN - Exception thrown
java.util.concurrent.ExecutionException: org.openqa.selenium.WebDriverException: java.lang.reflect.InvocationTargetException
Build info: version: '2.41.0', revision: '3192d8a', time: '2014-03-27 17:17:32'
System info: host: 'Dmitris-MacBook-Pro.local', ip: '172.20.10.2', os.name: 'Mac OS X', os.arch: 'x86_64', os.version: '10.8.5', java.version: '1.6.0_65'
Driver info: driver.version: unknown
at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:222)
at java.util.concurrent.FutureTask.get(FutureTask.java:83)
at org.openqa.selenium.remote.server.DefaultSession.execute(DefaultSession.java:177)
at org.openqa.selenium.remote.server.DefaultSession.<init>(DefaultSession.java:113)
at org.openqa.selenium.remote.server.DefaultSession.createSession(DefaultSession.java:90)
at org.openqa.selenium.remote.server.DefaultDriverSessions.newSession(DefaultDriverSessions.java:96)
at org.openqa.selenium.remote.server.handler.NewSession.handle(NewSession.java:63)
10:30:19.110 WARN - Exception: The driver executable does not exist: /usr/local/lib/node_modules/protractor/selenium/chromedriver

知道有什么问题吗？