setup.py not found when installing a module

[MarcoBazzani]

when I try to checking out a python project (coltrane blog app) from launchpad using gf.recipe.bzr I got this error:

Updating django.
django: Updating Django from svn
Installing coltrane.
coltrane: Getting trunk from bzr repository lp:coltrane-blog
Traceback (most recent call last):
  File "/var/folders/2M/2M9mdzewElCAD0lueH5KpE+++TI/-Tmp-/tmpJRXWCC", line 11, in <module>
    execfile('/Users/visi/Devel/python-workspace/blango/coltrane/trunk/setup.py')
IOError: [Errno 2] No such file or directory: '/Users/visi/Devel/python-workspace/blango/coltrane/trunk/setup.py'
While:
  Installing coltrane.

An internal error occured due to a bug in either zc.buildout or in a
recipe being used:
Traceback (most recent call last):
  File "/Users/visi/Devel/python-workspace/blango/eggs/zc.buildout-1.4.1-py2.6.egg/zc/buildout/buildout.py", line 1659, in main
    getattr(buildout, command)(args)
  File "/Users/visi/Devel/python-workspace/blango/eggs/zc.buildout-1.4.1-py2.6.egg/zc/buildout/buildout.py", line 532, in install
    installed_files = self[part]._call(recipe.install)
  File "/Users/visi/Devel/python-workspace/blango/eggs/zc.buildout-1.4.1-py2.6.egg/zc/buildout/buildout.py", line 1203, in _call
    return f()
  File "/Users/visi/Devel/python-workspace/blango/eggs/gf.recipe.bzr-1.0rc8-py2.6.egg/gf/recipe/bzr/bzr.py", line 188, in install
    self.egg_develop(branch)
  File "/Users/visi/Devel/python-workspace/blango/eggs/gf.recipe.bzr-1.0rc8-py2.6.egg/gf/recipe/bzr/bzr.py", line 302, in egg_develop
    self.options['develop-eggs-directory'],
  File "/Users/visi/Devel/python-workspace/blango/eggs/zc.buildout-1.4.1-py2.6.egg/zc/buildout/easy_install.py", line 895, in develop
    *args) == 0
AssertionError

this is the conf of the buildout.cfg

[coltrane]
recipe = gf.recipe.bzr
urls = lp:coltrane-blog trunk