关于python：Google App Engine：随机错误” ImportError：无法导入名称节点”

Google App Engine: Random error “ImportError: cannot import name nodes”

我最近访问了我的App Engine网站，该网站运行得很好，没有任何错误，并且显示了一个非常丑陋的错误页面。在管理工具App Engine中记录了以下错误：

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2012-09-06 10:53:43.938
Traceback (most recent call last):
File"/base/python27_runtime/python27_lib/versions/1/google/appengine/runtime/wsgi.py", line 189, in Handle
handler = _config_handle.add_wsgi_middleware(self._LoadHandler())
File"/base/python27_runtime/python27_lib/versions/1/google/appengine/runtime/wsgi.py", line 227, in _LoadHandler
handler = __import__(path[0])
File"/base/data/home/apps/s~myapp/1.361555922666090832/main.py", line 3, in <module>
from controllers.routes import api_routes, web_routes, admin_routes
File"/base/data/home/apps/s~myapp/1.361555922666090832/controllers/routes/api_routes.py", line 3, in <module>
from ..api import api_obj_controller, api_app_controller, api_path_controller, api_user_controller
File"/base/data/home/apps/s~myapp/1.361555922666090832/controllers/api/api_obj_controller.py", line 2, in <module>
from ..handlers.api_handler import ApiRequestHandler
File"/base/data/home/apps/s~myapp/1.361555922666090832/controllers/handlers/api_handler.py", line 2, in <module>
from ..handlers.content_handler import BaseRequestHandler
File"/base/data/home/apps/s~myapp/1.361555922666090832/controllers/handlers/content_handler.py", line 3, in <module>
from webapp2_extras import jinja2
File"/base/data/home/apps/s~myapp/1.361555922666090832/webapp2_extras/jinja2.py", line 15, in <module>
import jinja2
File"/base/python27_runtime/python27_lib/versions/third_party/jinja2-2.6/jinja2/__init__.py", line 33, in <module>
from jinja2.environment import Environment, Template
File"/base/python27_runtime/python27_lib/versions/third_party/jinja2-2.6/jinja2/environment.py", line 13, in <module>
from jinja2 import nodes
ImportError: cannot import name nodes
W 2012-09-06 10:53:43.967
After handling this request, the process that handled this request was found to have handled too many sequential errors, and was terminated. This is likely to cause a new process to be used for the next request to your application. If you see this message frequently, you are likely returning errors continously from your application.

因此它继续出现许多错误，但随后又重新开始工作，而没有发布任何新代码。很明显，我担心的是将来如何防止这种情况发生？为什么会这样呢？在没有部署任何代码修复的情况下，它如何能够自行纠正？此错误使我感到紧张，它会为我的客户随机发生。

编辑：

此外，我收到的第一个错误是DeadlineExceededError错误，其中包含消息"此请求导致为您的应用程序启动新进程，从而导致首次加载您的应用程序代码。因此，与您的应用程序的典型请求相比，该请求可能会花费更长的时间并使用更多的CPU。"

因此，从此消息以及Tim所评论的内容是完全有道理的，但是我该如何解决它，使其不再发生？我该怎么办，DeadlineExceededError基本上不会在整个新站点启动之前就将整个站点出错？ (也就是说，如果我正确理解的话)