python - BeautifulSoup指定lxml作为解析器报错？

环境：
windows 10
PyCharm 2016.3.2

遇到问题：

刚开始学python，想用BeautifulSoup解析网页，但出现报错：

UserWarning: No parser was explicitly specified, so I'm using the best available HTML parser for this system ("lxml"). This usually isn't a problem, but if you run this code on another system, or in a different virtual environment, it may use a different parser and behave differently.

The code that caused this warning is on line 4 of the file C:/Users/excalibur/PycharmProjects/learn/getMyIP.py. To get rid of this warning, change code that looks like this:

 BeautifulSoup([your markup])

to this:

 BeautifulSoup([your markup], "lxml")

  markup_type=markup_type))

然后根据提示和官网的文档加上：BeautifulSoup(markup, "html.parser")

结果出现了这样的报错：

在Google搜了下，都是说要导入路径，但是在 Settings -> Project -> Project Interpreter 里是这样的

显示BeautifulSoup已经导入了

请问我要怎么做才能解决这个问题呢？

万分感谢！