Google App Engine Guestbook application gives error - google-app-engine

Question

I upload the Google App Engine application which is at the url developers.google.com/appengine/docs/python/memcache/usingmemcache#Memcache
When I run the application on Google App Engine Launcher, it runs but the website shows:
(First error is there us no Python "PIL" module but I am not using image. Could you please suggest what is causing the error?
*** Running dev_appserver with the following flags:
--skip_sdk_update_check=yes --port=13080 --admin_port=8005
Python command: /usr/bin/python2.7
INFO 2014-01-17 20:43:22,217 devappserver2.py:660] Skipping SDK update check.
WARNING 2014-01-17 20:43:22,222 api_server.py:331] Could not initialize images API; you are likely missing the Python "PIL" module.
INFO 2014-01-17 20:43:22,226 api_server.py:138] Starting API server at: localhost:55385
INFO 2014-01-17 20:43:22,230 dispatcher.py:171] Starting module "default" running at: localhost:13080
INFO 2014-01-17 20:43:22,238 admin_server.py:117] Starting admin server at: localhost:8005
ERROR 2014-01-17 20:43:24,601 wsgi.py:262]
Traceback (most recent call last):
File "/Users/Desktop/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/runtime/wsgi.py", line 239, in Handle
handler = _config_handle.add_wsgi_middleware(self._LoadHandler())
File "/Users/Desktop/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/runtime/wsgi.py", line 301, in _LoadHandler
raise err
ImportError: <module 'guestbookw2' from '/Users/guestbookw2/guestbookw2.pyc'> has no attribute application
INFO 2014-01-17 20:43:24,607 module.py:617] default: "GET / HTTP/1.1" 500 -
ERROR 2014-01-17 20:43:24,727 wsgi.py:262]
Traceback (most recent call last):
File "/Users/Desktop/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/runtime/wsgi.py", line 239, in Handle
handler = _config_handle.add_wsgi_middleware(self._LoadHandler())
File "/Users/Desktop/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/runtime/wsgi.py", line 301, in _LoadHandler
raise err
ImportError: <module 'guestbookw12' from '/Users/guestbookw2/guestbookw2.pyc'> has no attribute application
INFO 2014-01-17 20:43:24,732 module.py:617] default: "GET /favicon.ico HTTP/1.1" 500 -

Answer 1

Make sure that you have the following files in the path that you are uploading your application from:
index.yaml (auto-generated; you don't need to add or change anything in here at this point).
favicon.ico (in the correct format; should be 16x16 or 32x32 pixels if I remember correctly).
main.py (mapping all the paths in your web-site; example given below):
from webapp2 import WSGIApplication
from Server import MainRequestHandler
from Server import SomeRequestHandler
from Server import OtherRequestHandler
app = WSGIApplication([
('/' ,MainRequestHandler),
('/abc' ,SomeRequestHandler),
('/def' ,SomeRequestHandler),
('/xyz' ,OtherRequestHandler),
])
app.yaml (with the following contents; using <...> where you need to set a value):
application: <the app-id you chose when use signed in for GAE>
version: 1
runtime: python27
api_version: 1
threadsafe: yes
handlers:
- url: /favicon\.ico
static_files: favicon.ico
upload: favicon\.ico
- url: .*
script: main.app
libraries:
- name: webapp2
version: "2.5.1" // you might need to change this as well
Note:
if you wish to avoid handling 'favicon.ico' request, then you must remove the reference in file 'app.yaml'.
Supplemental:
You will need to implement all the request handlers imported in 'main.py'.
In the example above, 'main.py' expects to find them in a Python module named 'Server'.
Each request handler must inherit class RequestHandler, imported from webapp2.
Supplemental #2:
In order to solve the 'PIL' issue (had a similar problem if memory serves correctly), simply install it.
From a Windows command line, enter: pip install pil.