Thank you!

Your suggestion fixed the "communication error" on Ubuntu Server 10.04
when saving files using ajax editor.
Here are the 3 steps in case you want to cut/paste to FAQ:

1. sudo aptitude install python-setuptools
2. sudo easy_install simplejson
3. sudo /etc/init.d/apache2 restart

Speaking of 3rd-party libraries, I noticed jquery 1.4.2 is
available :)

On Jun 7, 10:43 pm, mdipierro <mdipie...@cs.depaul.edu> wrote:
> aha. json problem. We upgraded to the latest simplejson. Yo may have
> an older version installed in your system that is conflicting with
> it.
>
> user easy_install to upgrade simplejson
>
> On Jun 7, 9:21 pm, Salvor Hardin <salvor.pub...@gmail.com> wrote:
>
>
>
> > I'm sorry, I looked in the wrong directory and made a mistake with
> > Firebug.
>
> > I found this in admin/errors/ and hope you find it useful:
>
> > Traceback (most recent call last):
> >   File "gluon/restricted.py", line 178, in restricted
> >     exec ccode in environment
> >   File "/srv/web2py/applications/admin/controllers/default.py", line
> > 1060, in <module>
> >   File "gluon/globals.py", line 96, in <lambda>
> >     self._caller = lambda f: f()
> >   File "/srv/web2py/applications/admin/controllers/default.py", line
> > 404, in edit
> >     return response.json({'file_hash': file_hash, 'saved_on':
> > saved_on, 'functions':functions, 'controller': controller,
> > 'application': request.args[0] })
> >   File "gluon/globals.py", line 203, in json
> >     return json(data)
> >   File "gluon/serializers.py", line 29, in json
> >     return simplejson.dumps(value)
> >   File "gluon/contrib/simplejson/__init__.py", line 228, in dumps
> >     return _default_encoder.encode(obj)
> >   File "gluon/contrib/simplejson/encoder.py", line 229, in encode
> >     chunks = self.iterencode(o, _one_shot=True)
> >   File "gluon/contrib/simplejson/encoder.py", line 290, in iterencode
> >     self.skipkeys, self.allow_nan, key_memo, self.use_decimal)
> > TypeError: make_encoder() takes at most 9 arguments (11 given)
>
> > On Jun 7, 1:04 pm, mdipierro <mdipie...@cs.depaul.edu> wrote:
>
> > > try the following. delete all your tickets app/errors/*
> > > reproduce the problem and see if you find a new ticket file. If so,
> > > please email it to me.
>
> > > On Jun 7, 12:43 pm, Salvor Hardin <salvor.pub...@gmail.com> wrote:
>
> > > > Here's what I tried:
>
> > > >  * I setup SSH tunnel from my Vista desktop's localhost:8080 to
> > > > ubuntu.private.lan:80.
> > > >  * I modified Apache2's <virtualhost *:80> to enable access to /admin
>
> > > > The new non-HTTPS, ssh-tunneled, remote URL to ubuntu.private.lan is:
>
> > > >    
> > > > http://localhost:8080/admin/default/edit/myblog/views/default/index.html
>
> > > > I got same problem again on Firefox and Chrome.  Files get saved
> > > > successfully, but "Last Saved On" field shows "communication error" in
> > > > red background color every time I click Save button.
>
> > > > Next, I'll try using Rocket on Ubuntu, just for debugging this
> > > > problem.  Rocket won't be approved for production servers here (this
> > > > summer), so I hope we can find a solution using Apache 2.2.14.
>
> > > > On Jun 7, 11:58 am, mdipierro <mdipie...@cs.depaul.edu> wrote:
>
> > > > > Does it work without ssl? Which browser are you using? Have you tried
> > > > > other browsers?
>
> > > > > Massimo
>
> > > > > On Jun 7, 11:47 am, Salvor Hardin <salvor.pub...@gmail.com> wrote:
>
> > > > > > I'm new to web2py and python (currently evaluating python frameworks
> > > > > > to replace Ruby on Rails on production servers by July 4th weekend.)
>
> > > > > > PROBLEM:
>
> > > > > >  * Saving a file using the admin interface displays a red
> > > > > > "communication error" in the "Last Saved On" field.  However, when I
> > > > > > click Reload in the browser, a new date and time appears correctly 
> > > > > > so
> > > > > > the file is successfully saved.
>
> > > > > > I'm using HTTPS (web2py is not running on 127.0.0.1.)
>
> > > > > > SYSTEM:
> > > > > >  * Software: web2py 1.79.1, Python 2.6.5, Apache 2.2.14, mod_wsgi 
> > > > > > 2.8,
> > > > > > OpenSSL 0.98k, sqlite 3.6.22
> > > > > >  * Browsers:  Latest stable versions of Chrome and Firefox on Vista 
> > > > > > 32-
> > > > > > bit
> > > > > >  * OS: Ubuntu Server 10.04 LTS guest running in Virtual PC 2007 SP1 
> > > > > > on
> > > > > > Vista 32-bit host
> > > > > >           (because Virtual PC 2007 only uses ~16 (sixteen) MB RAM 
> > > > > > for
> > > > > > actively used Ubuntu Server 10.04 guest setup with 512 MB RAM,
> > > > > >            and because my work desktop is Vista, and I need to 
> > > > > > develop
> > > > > > web apps on identical OS & packages as the production server due to
> > > > > > policy)
>
> > > > > > CONFIGURATION:
>
> > > > > > I'm using HTTPS, so here's the SSL portion of the Apache2 config
> > > > > > (ubuntu.private.lan is the dev machine mapped to a LAN address):
>
> > > > > > <VirtualHost *:80>
> > > > > >   ServerName ubuntu.private.lan
> > > > > >   WSGIDaemonProcess web2py user=www-data group=www-data display-
> > > > > > name=web2py
> > > > > >    ...
> > > > > > </VirtualHost>
>
> > > > > > <IfModule mod_ssl.c>
> > > > > > <VirtualHost *:443>
> > > > > >   ServerName ubuntu.private.lan
>
> > > > > >   SSLEngine on
> > > > > >   SSLCertificateFile    /etc/ssl/certs/ssl-cert-snakeoil.pem
> > > > > >   SSLCertificateKeyFile /etc/ssl/private/ssl-cert-snakeoil.key
> > > > > >   <FilesMatch "\.(cgi|shtml|phtml|php)$">
> > > > > >       SSLOptions +StdEnvVars
> > > > > >   </FilesMatch>
> > > > > >   <Directory /usr/lib/cgi-bin>
> > > > > >       SSLOptions +StdEnvVars
> > > > > >   </Directory>
> > > > > >   BrowserMatch "MSIE [2-6]" nokeepalive ssl-unclean-shutdown
> > > > > > downgrade-1.0 force-response-1.0
> > > > > >   # MSIE 7 and newer should be able to use keepalive
> > > > > >   BrowserMatch "MSIE [17-9]" ssl-unclean-shutdown
>
> > > > > >   # WSGIDaemonProcess defined is under <VirtualHost *:80> as:
> > > > > > WSGIDaemonProcess web2py user=www-data group=www-data display-
> > > > > > name=web2py
> > > > > >   WSGIProcessGroup web2py
> > > > > >   WSGIScriptAlias / /srv/web2py/wsgihandler.py
>
> > > > > >   <Directory /srv/web2py>
> > > > > >     AllowOverride None
> > > > > >     Order Allow,Deny
> > > > > >     Deny from all
> > > > > >     <Files wsgihandler.py>
> > > > > >       Allow from all
> > > > > >     </Files>
> > > > > >   </Directory>
>
> > > > > >   AliasMatch ^/([^/]+)/static/(.*) \
> > > > > >         /srv/web2py/applications/$1/static/$2
>
> > > > > >   <Directory /srv/web2py/applications/*/static/>
> > > > > >     Order Allow,Deny
> > > > > >     Allow from all
> > > > > >   </Directory>
>
> > > > > >   CustomLog /var/log/apache2/access.log common
> > > > > >   ErrorLog /var/log/apache2/error.log
>
> > > > > > </VirtualHost>
> > > > > > </IfModule>

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