Today: constant JSON::Parser not defined

(Using the latest 3-0-stable and rvm, and ruby-1.9.2-p0)

Yesterday everything worked, my own changes are very minor and in the
application only. Did anything change that could have caused this
problem? Unfortunately simply going back in rails alone to the
original "RC2" git-tag did not immediately help, so it may be some
other problem (on my own system only, even if I'm convinced I didn't
change anything significant since yesterday except for running "bundle
update" once too often, maybe).

mha@ubuntu-vm:~/Letexa$ rails server
=> Booting WEBrick
=> Rails 3.0.0.rc2 application starting in development on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
Exiting
/home/mha/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/json/common.rb:
27:in `remove_const': constant JSON::Parser not defined (NameError)
  from /home/mha/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/json/
common.rb:27:in `parser='
  from /home/mha/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/json/ext.rb:
10:in `<module:Ext>'
  from /home/mha/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/json/ext.rb:
6:in `<module:JSON>'
  from /home/mha/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/json/ext.rb:
3:in `<top (required)>'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:239:in `require'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:239:in `block in
require'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:225:in `block in
load_dependency'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:591:in
`new_constants_in'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:225:in
`load_dependency'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:239:in `require'
  from /home/mha/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/json.rb:6:in
`<module:JSON>'
  from /home/mha/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/json.rb:2:in
`<top (required)>'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:239:in `require'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:239:in `block in
require'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:225:in `block in
load_dependency'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:591:in
`new_constants_in'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:225:in
`load_dependency'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:239:in `require'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/core_ext/object/to_json.rb:3:in `<top
(required)>'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:239:in `require'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:239:in `block in
require'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:225:in `block in
load_dependency'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:591:in
`new_constants_in'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:225:in
`load_dependency'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:239:in `require'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/core_ext/object.rb:10:in `<top
(required)>'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:239:in `require'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:239:in `block in
require'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:225:in `block in
load_dependency'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:591:in
`new_constants_in'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:225:in
`load_dependency'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:239:in `require'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/core_ext.rb:2:in `block in <top
(required)>'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/core_ext.rb:1:in `each'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/core_ext.rb:1:in `<top (required)>'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:239:in `require'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:239:in `block in
require'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:225:in `block in
load_dependency'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:591:in
`new_constants_in'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:225:in
`load_dependency'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:239:in `require'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/all.rb:3:in `<top (required)>'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:239:in `require'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:239:in `block in
require'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:225:in `block in
load_dependency'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:591:in
`new_constants_in'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:225:in
`load_dependency'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:239:in `require'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
railties/lib/rails/application/bootstrap.rb:16:in `block in
<module:Bootstrap>'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
railties/lib/rails/initializable.rb:25:in `instance_exec'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
railties/lib/rails/initializable.rb:25:in `run'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
railties/lib/rails/initializable.rb:50:in `block in run_initializers'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
railties/lib/rails/initializable.rb:49:in `each'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
railties/lib/rails/initializable.rb:49:in `run_initializers'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
railties/lib/rails/application.rb:134:in `initialize!'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
railties/lib/rails/application.rb:77:in `method_missing'
  from /home/mha/Letexa/config/environment.rb:6:in `<top (required)>'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:239:in `require'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:239:in `block in
require'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:225:in `block in
load_dependency'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:591:in
`new_constants_in'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:225:in
`load_dependency'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
activesupport/lib/active_support/dependencies.rb:239:in `require'
  from /home/mha/Letexa/config.ru:3:in `block in <main>'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/gems/rack-1.2.1/lib/rack/
builder.rb:46:in `instance_eval'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/gems/rack-1.2.1/lib/rack/
builder.rb:46:in `initialize'
  from /home/mha/Letexa/config.ru:1:in `new'
  from /home/mha/Letexa/config.ru:1:in `<main>'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/gems/rack-1.2.1/lib/rack/
builder.rb:35:in `eval'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/gems/rack-1.2.1/lib/rack/
builder.rb:35:in `parse_file'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/gems/rack-1.2.1/lib/rack/
server.rb:162:in `app'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/gems/rack-1.2.1/lib/rack/
server.rb:248:in `wrapped_app'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/gems/rack-1.2.1/lib/rack/
server.rb:213:in `start'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
railties/lib/rails/commands/server.rb:65:in `start'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
railties/lib/rails/commands.rb:30:in `block in <top (required)>'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
railties/lib/rails/commands.rb:27:in `tap'
  from /home/mha/.rvm/gems/ruby-1.9.2-p0/bundler/gems/rails-9df512b/
railties/lib/rails/commands.rb:27:in `<top (required)>'
  from script/rails:9:in `require'
  from script/rails:9:in `<main>'

Just FYI, to not let this question stay in the archive unanswered:
turns out if I remove the gem swf_file everything works again. Further
investigation revealed that the module named "Parser" inside that gem
must have caused a conflict - commenting out use of just that module
let me load the gem just fine. I'm going to tell the author.

(Using the latest 3-0-stable and rvm, and ruby-1.9.2-p0)

Yesterday everything worked, my own changes are very minor and in the
application only. Did anything change that could have caused this
problem? Unfortunately simply going back in rails alone to the
original "RC2" git-tag did not immediately help, so it may be some
other problem (on my own system only, even if I'm convinced I didn't
change anything significant since yesterday except for running "bundle
update" once too often, maybe).

mha@ubuntu-vm:~/Letexa$ rails server

...

Exiting
/home/mha/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/json/common.rb:
27:in `remove_const': constant JSON::Parser not defined (NameError)
from /home/mha/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/json/
common.rb:27:in `parser='

....

Hello,

http://github.com/DBA/swf_file/tree/v1.1.0.rc.2 should fix that issue.
However, please make sure that you read the history:
http://github.com/DBA/swf_file/blob/v1.1.0.rc.2/HISTORY.md

Should the problems persist, let me know.

Best regards,
DBA