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Editorial Team
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Asked: 2026-05-15T11:55:17+00:00

I’m using VirtualBox on Windows to run an Ubuntu OS, which is running the

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I’m using VirtualBox on Windows to run an Ubuntu OS, which is running the turnkey rails package, which comes with ruby 1.8, rails 2.3.8, and passenger 2.2.5. When I first booted it up with just a vanilla rails app it worked fine, but now I’m getting the following error:

uninitialized constant PhusionPassenger::Utils::PseudoIO::StringIO

I googled this, and on the phusion/google groups it said this was an old error and to upgrade passenger, which I did with gem upgrade passenger. It said it was installing passenger 2.2.15, but it doesn’t appear to be using it. I re-started the whole virtualbox and it is still giving me the same error, with the backtrace showing passenger-2.2.5.

I realize there are several layers here and plenty of places for things to go wrong, and to add to that, I’m pretty much a Linux newb. I’ve got some experience with rails. I’d appreciate any help.

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1 Answer

  1. Editorial Team

    It could well be your Apache configuration file. When Passenger installs it adds some code to the /etc/apache2/http.conf file so that Apache loads the Passenger extension. This code includes the version number so if you’ve changed the version of Apache you’ll need to modify this file. The code you’re looking for looks like this

    LoadModule passenger_module /opt/local/lib/ruby/gems/1.8/gems/passenger-2.2.15/ext/apache2/mod_passenger.so
PassengerRoot /opt/local/lib/ruby/gems/1.8/gems/passenger-2.2.15
PassengerRuby /opt/local/bin/ruby

    You’ll have to be authenticated to edit the file so open a terminal window and type

    sudo gedit /etc/apache2/http.conf

    and enter your password to edit the file. Once you’ve made the changes close gedit then run

    sudo /etc/init.d/apache2 restart

    to restart Apache and try your Rails application again.

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