2011-04-08 11:34:40,095 Trac[main] ERROR: Internal Server Error: 
Traceback (most recent call last):
  File "build\bdist.win32\egg\trac\web\main.py", line 511, in _dispatch_request
    dispatcher.dispatch(req)
  File "build\bdist.win32\egg\trac\web\main.py", line 237, in dispatch
    resp = chosen_handler.process_request(req)
  File "build\bdist.win32\egg\estimationtools\utils.py", line 75, in process_request
    chart_req = urllib2.Request('GET', url.encode('utf-8'), '', {})
  File "D:\BITNAM~1.2\apache2\bin\lib\urllib2.py", line 200, in __init__
    for key, value in headers.items():
AttributeError: 'str' object has no attribute 'items'