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Editorial Team
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Asked: 2026-05-25T23:57:46+00:00

I am using RVM and have installed rails 3.1.0 multiple times but once I

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I am using RVM and have installed rails 3.1.0 multiple times but once I begin using it I get the same error over and over again.

From a fresh install of rails 3.1.0 I do the following:

rails new fishapp

cd fishapp

bundle install

rails g scaffold Fish name:string

bundle exec rake db:migrate

But each time I go to http://localhost:3000/fish I get:

Showing /Users/me/code/rails31/fishapp/app/views/layouts/application.html.erb where line #6 raised:

uninitialized constant JSON::ParserError
  (in /Users/me/code/rails31/fishapp/app/assets/javascripts/fish.js.coffee)

Extracted source (around line #6):

3: <head>
4:   <title>Fishapp</title>
5:   <%= stylesheet_link_tag    "application" %>
6:   <%= javascript_include_tag "application" %>
7:   <%= csrf_meta_tags %>
8: </head>
9: <body>

I must have broke something trying to get rails installed or something as I don’t otherwise understand why it would fail of a fresh install. Any ideas?

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1 Answer

  1. Editorial Team

    Initially I simply commented out line #6 (just so I could keep working).

    <%#= javascript_include_tag "application" %>

    Eventually I needed javascript, so I had to return to this issue. I kept the line above commented out, and just hard-coded this one immediately below it:

    <script src="/assets/application.js" type="text/javascript"></script>

    The page loaded fine, so I viewed the page’s source, and looked at 

    http://0.0.0.0:3000/assets/application.js

    … only to find a similar error:

    throw Error("NameError: uninitialized constant JSON::ParserError
(in /Users/me/Dev/fishapp/app/assets/javascripts/products.js.coffee)")

    So I decided to load a rails console and see if I could load the JSON gem, but got an error with iconv:

    ruby-1.9.2-p290 :001 > require 'json'
LoadError: no such file to load -- iconv

    Meanwhile loading the rails gem produced:

    ruby-1.9.2-p290 :004 > require 'rails'
 => false

    So I searched around and found this:

    http://beginrescueend.com/packages/iconv/

    Follow those instructions, and your problem will be resolved! For the record, those instructions are:

    rvm pkg install iconv
rvm remove 1.9.2
rvm install 1.9.2 --with-iconv-dir=$rvm_path/usr

    I’m leaving the steps I took in case others search Google for similar errors.

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