Installing nova in CentOS III

I downloaded the last tarball and when I tried the command: # nova-manage project zipfile NOVA palvarez

I got a new message error:

[root@cloud openstack]# nova-manage project zipfile NOVA palvarez
Generating RSA private key, 1024 bit long modulus
....................................++++++
.....................++++++
e is 65537 (0x10001)
Traceback (most recent call last):
  File "/usr/bin/nova-manage", line 5, in <module>
    pkg_resources.run_script('nova==2011.1', 'nova-manage')
  File "/usr/lib/python2.6/site-packages/pkg_resources.py", line 461, in run_script
    self.require(requires)[0].run_script(script_name, ns)
  File "/usr/lib/python2.6/site-packages/pkg_resources.py", line 1194, in run_script
    execfile(script_filename, namespace, namespace)
  File "/usr/lib/python2.6/site-packages/nova-2011.1-py2.6.egg/EGG-INFO/scripts/nova-manage", line 508, in <module>
    main()
  File "/usr/lib/python2.6/site-packages/nova-2011.1-py2.6.egg/EGG-INFO/scripts/nova-manage", line 500, in main
    fn(*argv)
  File "/usr/lib/python2.6/site-packages/nova-2011.1-py2.6.egg/EGG-INFO/scripts/nova-manage", line 362, in zipfile
    zip_file = self.manager.get_credentials(user_id, project_id)
  File "/usr/lib/python2.6/site-packages/nova-2011.1-py2.6.egg/nova/auth/manager.py", line 635, in get_credentials
    private_key, signed_cert = self._generate_x509_cert(user.id, pid)
  File "/usr/lib/python2.6/site-packages/nova-2011.1-py2.6.egg/nova/auth/manager.py", line 697, in _generate_x509_cert
    signed_cert = crypto.sign_csr(csr, pid)
  File "/usr/lib/python2.6/site-packages/nova-2011.1-py2.6.egg/nova/crypto.py", line 129, in sign_csr
    return _sign_csr(csr_text, FLAGS.ca_path)
  File "/usr/lib/python2.6/site-packages/nova-2011.1-py2.6.egg/nova/crypto.py", line 148, in _sign_csr
    os.chdir(ca_folder)
OSError: [Errno 2] No such file or directory: '/usr/lib/python2.6/site-packages/nova-2011.1-py2.6.egg/nova/..//CA'

some Idea?