Django error when I run ./manage syncdb

Question

I'm new at Django , and I got an existent project and I need to runserver , I activated virtual env and install all the requirements from the file "requirements.txt" ane then i try to syncdb and i got this error: (all the requirements is installed well )

(venv)➜ gates git:(master) ✗ ./manageweb.py syncdb

Traceback (most recent call last):
  File "./manageweb.py", line 12, in <module>
    execute_from_command_line(sys.argv)
  File "/Users/almog/django-trunk/django/core/management/__init__.py",
line 338, in execute_from_command_line
    utility.execute()
  File "/Users/almog/django-trunk/django/core/management/__init__.py",
line 330, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/Users/almog/django-trunk/django/core/management/base.py",
line 378, in run_from_argv
    parser = self.create_parser(argv[0], argv[1])
  File "/Users/almog/django-trunk/django/core/management/base.py",
line 327, in create_parser
    parser.add_option(opt)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/optparse.py",
line 1021, in add_option
    self._check_conflict(option)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/optparse.py",
line 996, in _check_conflict
    option)
optparse.OptionConflictError: option --verbosity: conflicting option
string(s): --verbosity

• I work on OS X Yosemite.