Django mod_wsgi和haystack=错误500

我在Django项目中使用Haystack，使用Django服务器一切都很好。当我要在Apache上运行时，我收到一个错误500；更准确地说，从日志：

mod_wsgi (pid=4536): Exception occurred processing WSGI script 

'/opt/local/apache2/htdocs/meishi/meishi/wsgi.py'.
Traceback (most recent call last):
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]   File "/Applications/MAMP/htdocs/Django-1.4/django/core/handlers/wsgi.py", line 241, in __call__
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]     response = self.get_response(request)
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]   File "/Applications/MAMP/htdocs/Django-1.4/django/core/handlers/base.py", line 179, in get_response
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]     response = self.handle_uncaught_exception(request, resolver, sys.exc_info())
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]   File "/Applications/MAMP/htdocs/Django-1.4/django/core/handlers/base.py", line 221, in handle_uncaught_exception
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]     return debug.technical_500_response(request, *exc_info)
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]   File "/Applications/MAMP/htdocs/Django-1.4/django/views/debug.py", line 66, in technical_500_response
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]     html = reporter.get_traceback_html()
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]   File "/Applications/MAMP/htdocs/Django-1.4/django/views/debug.py", line 276, in get_traceback_html
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]     return t.render(c)
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]   File "/Applications/MAMP/htdocs/Django-1.4/django/template/base.py", line 140, in render
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]     return self._render(context)
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]   File "/Applications/MAMP/htdocs/Django-1.4/django/template/base.py", line 134, in _render
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]     return self.nodelist.render(context)
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]   File "/Applications/MAMP/htdocs/Django-1.4/django/template/base.py", line 823, in render
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]     bit = self.render_node(node, context)
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]   File "/Applications/MAMP/htdocs/Django-1.4/django/template/debug.py", line 74, in render_node
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]     return node.render(context)
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]   File "/Applications/MAMP/htdocs/Django-1.4/django/template/debug.py", line 84, in render
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]     output = self.filter_expression.resolve(context)
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]   File "/Applications/MAMP/htdocs/Django-1.4/django/template/base.py", line 599, in resolve
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]     new_obj = func(obj, *arg_vals)
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]   File "/Applications/MAMP/htdocs/Django-1.4/django/template/defaultfilters.py", line 718, in date
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]     return format(value, arg)
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]   File "/Applications/MAMP/htdocs/Django-1.4/django/utils/dateformat.py", line 310, in format
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]     return df.format(format_string)
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]   File "/Applications/MAMP/htdocs/Django-1.4/django/utils/dateformat.py", line 33, in format
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]     pieces.append(force_unicode(getattr(self, piece)()))
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]   File "/Applications/MAMP/htdocs/Django-1.4/django/utils/dateformat.py", line 214, in r
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]     return self.format('D, j M Y H:i:s O')
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]   File "/Applications/MAMP/htdocs/Django-1.4/django/utils/dateformat.py", line 33, in format
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]     pieces.append(force_unicode(getattr(self, piece)()))
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]   File "/Applications/MAMP/htdocs/Django-1.4/django/utils/encoding.py", line 71, in force_unicode
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]     s = unicode(s)
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]   File "/Applications/MAMP/htdocs/Django-1.4/django/utils/functional.py", line 121, in __unicode_cast
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]     return func(*self.__args, **self.__kw)
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]   File "/Applications/MAMP/htdocs/Django-1.4/django/utils/translation/__init__.py", line 86, in ugettext
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]     return _trans.ugettext(message)
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]   File "/Applications/MAMP/htdocs/Django-1.4/django/utils/translation/trans_real.py", line 278, in ugettext
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]     return do_translate(message, 'ugettext')
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]   File "/Applications/MAMP/htdocs/Django-1.4/django/utils/translation/trans_real.py", line 268, in do_translate
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]     _default = translation(settings.LANGUAGE_CODE)
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]   File "/Applications/MAMP/htdocs/Django-1.4/django/utils/translation/trans_real.py", line 183, in translation
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]     default_translation = _fetch(settings.LANGUAGE_CODE)
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]   File "/Applications/MAMP/htdocs/Django-1.4/django/utils/translation/trans_real.py", line 160, in _fetch
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]     app = import_module(appname)
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]   File "/Applications/MAMP/htdocs/Django-1.4/django/utils/importlib.py", line 35, in import_module
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1]     __import__(name)
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1] ImportError: No module named haystack
[Wed Apr 25 13:41:52 2012] [error] [client 127.0.0.1] File does not exist: /opt/local/apache2/htdocs/favicon.ico

在我的项目中使用Haystack之前，我对mod_wsgi一点问题都没有，一切都很好。

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可能是什么问题？

该错误表明mod_wsgi正在使用的Python安装中没有安装“haystack”模块。找出“haystack”模块的安装位置，并确保它与mod_wsgi使用的Python安装相同。

提供错误日志中的实际跟踪和异常消息，而不仅仅是之前的一行消息。我也遇到过同样的问题，知道错误的含义肯定有助于解决问题。我犯了一个愚蠢的错误，我没有激活安装haystack的虚拟环境。