我正在尝试将django-nonrel设置为新的virtualenv，但收到的错误是：OSError: [Errno 2] No such file or directory。
我无法从错误日志中确切地知道缺少哪个文件或目录。请问有人可能会建议可能出现的问题吗？
bitbucket文件似乎存在：
(nonrel)delirium:nonrel anna$ pip install hg+https://bitbucket.org/wkornewald/django-nonrel
Downloading/unpacking hg+https://bitbucket.org/wkornewald/django-nonrel
Cloning hg https://bitbucket.org/wkornewald/django-nonrel to /var/folders/q5/_0_8qh59147_0vmr8tm1_mq80000gn/T/pip-3Trv56-build
Error [Errno 2] No such file or directory while executing command /usr/local/bin/hg clone --noupdate -q https://bitbucket.org/wkornewald/django-nonrel /var/folders/q5/_0_8qh59147_0vmr8tm1_mq80000gn/T/pip-3Trv56-build
Exception:
Traceback (most recent call last):
File "/Users/anna/Dropbox/nonrel/lib/python2.7/site-packages/pip-1.1-py2.7.egg/pip/basecommand.py", line 104, in main
status = self.run(options, args)
File "/Users/anna/Dropbox/nonrel/lib/python2.7/site-packages/pip-1.1-py2.7.egg/pip/commands/install.py", line 245, in run
requirement_set.prepare_files(finder, force_root_egg_info=self.bundle, bundle=self.bundle)
File "/Users/anna/Dropbox/nonrel/lib/python2.7/site-packages/pip-1.1-py2.7.egg/pip/req.py", line 985, in prepare_files
self.unpack_url(url, location, self.is_download)
File "/Users/anna/Dropbox/nonrel/lib/python2.7/site-packages/pip-1.1-py2.7.egg/pip/req.py", line 1103, in unpack_url
return unpack_vcs_link(link, loc, only_download)
File "/Users/anna/Dropbox/nonrel/lib/python2.7/site-packages/pip-1.1-py2.7.egg/pip/download.py", line 294, in unpack_vcs_link
vcs_backend.unpack(location)
File "/Users/anna/Dropbox/nonrel/lib/python2.7/site-packages/pip-1.1-py2.7.egg/pip/vcs/__init__.py", line 233, in unpack
self.obtain(location)
File "/Users/anna/Dropbox/nonrel/lib/python2.7/site-packages/pip-1.1-py2.7.egg/pip/vcs/mercurial.py", line 81, in obtain
call_subprocess([self.cmd, 'clone', '--noupdate', '-q', url, dest])
File "/Users/anna/Dropbox/nonrel/lib/python2.7/site-packages/pip-1.1-py2.7.egg/pip/__init__.py", line 221, in call_subprocess
cwd=cwd, env=env)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 672, in __init__
errread, errwrite)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 1202, in _execute_child
raise child_exception
OSError: [Errno 2] No such file or directory
Storing complete log in /Users/anna/.pip/pip.log
出了什么问题？