assert len(result) == 1, str(result)

bin/buildout
Develop: '/Users/sridharr/project/trunk/.'
While:
  Installing.
  Processing develop directory '/Users/sridharr/project/trunk/.'.

An internal error occured due to a bug in either zc.buildout or in a
recipe being used:
Traceback (most recent call last):
  File "/private/var/buildout/zc.buildout-1.5.0b2-py2.7.egg/zc/buildout/buildout.py", line 1660, in main
    getattr(buildout, command)(args)
  File "/private/var/buildout/zc.buildout-1.5.0b2-py2.7.egg/zc/buildout/buildout.py", line 394, in install
    installed_develop_eggs = self._develop()
  File "/private/var/buildout/zc.buildout-1.5.0b2-py2.7.egg/zc/buildout/buildout.py", line 634, in _develop
    zc.buildout.easy_install.develop(setup, dest)
  File "/private/var/buildout/zc.buildout-1.5.0b2-py2.7.egg/zc/buildout/easy_install.py", line 897, in develop
    return _copyeggs(tmp3, dest, '.egg-link', undo)
  File "/private/var/buildout/zc.buildout-1.5.0b2-py2.7.egg/zc/buildout/easy_install.py", line 830, in _copyeggs
    assert len(result) == 1, str(result)
AssertionError: []
make: *** [buildout] Error 1