TypeError: iter() takes no keyword arguments

I'm working with xml.etree.cElementTree, and regarding to official documentation - want find element in Element:

$ python --version
Python 2.7.8

My script:

#!/usr/bin/env python

import os, re

import xml.etree.ElementTree as ET

XML_FILE = '/cygdrive/****.csproj'

try:
    tree = ET.ElementTree(file=XML_FILE)
    root = tree.getroot()

    print type(root)

    for item in root.iter(tag='OutputPath'):
        print item.tag, item.attrib, item.text
    ....

But when I run it - have an error:

$ ./xm_par.py
<type 'Element'>
Traceback (most recent call last):
  File "./xm_par.py", line 21, in <module>
    for item in root.iter(tag='OutputPath'):
TypeError: iter() takes no keyword arguments

What I'm miss here?