Couldn't find a tree builder with the features you requested: lxml

[c0d3x27]

Launching Firefox/Iceweasel
Signing in...
Traceback (most recent call last):
File "mediumbot.py", line 550, in
Launch()
File "mediumbot.py", line 61, in Launch
StartBrowser(2)
File "mediumbot.py", line 88, in StartBrowser
soup = BeautifulSoup(browser.page_source, "lxml")
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/bs4/init.py", line 246, in init
% ",".join(features))
bs4.FeatureNotFound: Couldn't find a tree builder with the features you requested: lxml. Do you need to install a parser library?
c0d3x27|master:~/Desktop/MediumBot$