mitmproxy install error

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What I miss ???
I did follow README and can't install
please help

Please upload the image in the greater resolution, or full size. I can not seem to read font ants.
*Watch for the cmd line. You there pops up an error about lxml program.

Quote:

pip install lxml=3.3.6

[IMG=border: 3, expandable: 0]https://www.facebook.com/photo.php?fbid=825691434220090&set=gm.505898416258 462&type=3[/IMG