Firefox WebDriver实例不是使用selenium python绑定创建的

我安装了selenium python绑定并尝试创建firefox web驱动程序的实例 如下

我不知道这里出了什么问题，它显示了以下错误

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.7/site-packages/selenium-2.21.3-py2.7.egg/selenium/webdriver/firefox/webdriver.py", line 51, in __init__
    self.binary, timeout),
  File "/usr/lib/python2.7/site-packages/selenium-2.21.3-py2.7.egg/selenium/webdriver/firefox/extension_connection.py", line 47, in __init__
    self.binary.launch_browser(self.profile)
  File "/usr/lib/python2.7/site-packages/selenium-2.21.3-py2.7.egg/selenium/webdriver/firefox/firefox_binary.py", line 44, in launch_browser
    self._wait_until_connectable()
  File "/usr/lib/python2.7/site-packages/selenium-2.21.3-py2.7.egg/selenium/webdriver/firefox/firefox_binary.py", line 81, in _wait_until_connectable
    self._get_firefox_output())
selenium.common.exceptions.WebDriverException: Message: 'The browser appears to have exited before we could connect. The output was: Error: cannot open display: :1100\n' 

回溯（最近一次呼叫最后一次）：
文件“”，第1行，在
文件“/usr/lib/python2.7/site packages/selenium-2.21.3-py2.7.egg/selenium/webdriver/firefox/webdriver.py”，第51行，在__
self.binary，超时），
文件“/usr/lib/python2.7/site packages/selenium-2.21.3-py2.7.egg/selenium/webdriver/firefox/extension_connection.py”，第47行，在u init中__
self.binary.launch_浏览器（self.profile）
文件“/usr/lib/python2.7/site packages/selenium-2.21.3-py2.7.egg/selenium/webdriver/firefox/firefox\u binary.py”，第44行，在launch\u浏览器中
self.\u等待\u直到\u可连接（）
文件“/usr/lib/python2.7/site packages/selenium-2.21.3-py2.7.egg/selenium/webdriver/firefox/firefox\u binary.py”，第81行，在“等待”直到“可连接”
self.\u获取\u firefox\u输出（）
selenium.common.exceptions.WebDriverException:Message:“在我们连接之前，浏览器似乎已退出。”。输出为：错误：无法打开显示：：1100\n

请告诉我如何解决这个问题………

错误是“无法打开显示器：：1100”。你是在远程终端上运行它吗？确保您可以在提示符处键入“firefox”并打开浏览器（这就是Webdriver所做的-在您的系统上打开firefox，然后尝试连接到它）。如果在远程系统上运行，请在远程连接到X display时进行web搜索

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.7/site-packages/selenium-2.21.3-py2.7.egg/selenium/webdriver/firefox/webdriver.py", line 51, in __init__
    self.binary, timeout),
  File "/usr/lib/python2.7/site-packages/selenium-2.21.3-py2.7.egg/selenium/webdriver/firefox/extension_connection.py", line 47, in __init__
    self.binary.launch_browser(self.profile)
  File "/usr/lib/python2.7/site-packages/selenium-2.21.3-py2.7.egg/selenium/webdriver/firefox/firefox_binary.py", line 44, in launch_browser
    self._wait_until_connectable()
  File "/usr/lib/python2.7/site-packages/selenium-2.21.3-py2.7.egg/selenium/webdriver/firefox/firefox_binary.py", line 81, in _wait_until_connectable
    self._get_firefox_output())
selenium.common.exceptions.WebDriverException: Message: 'The browser appears to have exited before we could connect. The output was: Error: cannot open display: :1100\n'