I'm trying to upgrade trac from 1.0.1-3 to 1.2.3 using this command:

C:\Bitnami\trac-1.0.1-3>easy_install -a 
--prefix="C:\Bitnami\trac-1.0.1-3\apps\trac" -d 
"C:\Bitnami\trac-1.0.1-3\apps\trac\Lib\site-packages" -s 
"C:\Bitnami\trac-1.0.1-3\apps\trac\Scripts" --upgrade Trac==1.2.3


and I get this message :

Searching for Trac==1.2.3

Reading http://pypi.python.org/simple/Trac/

Couldn't retrieve index page for 'Trac'

Scanning index of all packages (this may take a while)

Reading http://pypi.python.org/simple/

No local packages or download links found for Trac==1.2.3

Best match: None

Traceback (most recent call last):

  File "C:\Bitnami\trac-1.0.1-3\apps\trac\Scripts\easy_install-script.py", 
line 8, in <module>

    load_entry_point('setuptools==0.6c11', 'console_scripts', 
'easy_install')()

  File 
"c:\bitnami\trac-1.0.1-3\python\lib\site-packages\setuptools-0.6c11-py2.7.egg\setuptools\command\easy_install.py",
 
line 1712, in main

  File 
"c:\bitnami\trac-1.0.1-3\python\lib\site-packages\setuptools-0.6c11-py2.7.egg\setuptools\command\easy_install.py",
 
line 1700, in with_ei_usage

  File 
"c:\bitnami\trac-1.0.1-3\python\lib\site-packages\setuptools-0.6c11-py2.7.egg\setuptools\command\easy_install.py",
 
line 1716, in <lambda>

  File "C:\Bitnami\trac-1.0.1-3\python\lib\distutils\core.py", line 152, in 
setup

    dist.run_commands()

  File "C:\Bitnami\trac-1.0.1-3\python\lib\distutils\dist.py", line 953, in 
run_commands

    self.run_command(cmd)

  File "C:\Bitnami\trac-1.0.1-3\python\lib\distutils\dist.py", line 972, in 
run_command

    cmd_obj.run()

  File 
"c:\bitnami\trac-1.0.1-3\python\lib\site-packages\setuptools-0.6c11-py2.7.egg\setuptools\command\easy_install.py",
 
line 211, in run

  File 
"c:\bitnami\trac-1.0.1-3\python\lib\site-packages\setuptools-0.6c11-py2.7.egg\setuptools\command\easy_install.py",
 
line 434, in easy_install

  File 
"c:\bitnami\trac-1.0.1-3\python\lib\site-packages\setuptools-0.6c11-py2.7.egg\setuptools\package_index.py",
 
line 475, in fetch_distribution

AttributeError: 'NoneType' object has no attribute 'clone'

trac python version : 2.7.6
setuptools version : 0.6c11
How I can resolve this issue?

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