Resque with Redis To Go can't work as expectation - ruby

Question

I need to use Resque to enqueue my jobs on Heroku.
As it's my first time to use it, I follow the instruction on this site:Resque with Redis To Go.
When I run the command:
$ rake resque:work QUEUE=*
the terminal shows:
rake aborted!
Please install the yajl-ruby or json gem
(See full trace by running task with --trace)
I had installed both yajl-ruby and json gem after I got the error; however, it didn't work.
If I ignore the problem and enter "rails s" to start the server.
It shows:
/Library/Ruby/Gems/1.8/gems/resque-1.19.0/lib/resque/helpers.rb:6: Please install the yajl-ruby or json gem (RuntimeError)
from /Library/Ruby/Gems/1.8/gems/resque-1.19.0/lib/resque.rb:10:in `require'
from /Library/Ruby/Gems/1.8/gems/resque-1.19.0/lib/resque.rb:10
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.18/lib/bundler/runtime.rb:68:in `require'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.18/lib/bundler/runtime.rb:68:in `require'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.18/lib/bundler/runtime.rb:66:in `each'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.18/lib/bundler/runtime.rb:66:in `require'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.18/lib/bundler/runtime.rb:55:in `each'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.18/lib/bundler/runtime.rb:55:in `require'
from /Library/Ruby/Gems/1.8/gems/bundler-1.0.18/lib/bundler.rb:120:in `require'
from /Users/Brian/Documents/cookie-monster/config/application.rb:7
from /Library/Ruby/Gems/1.8/gems/railties-3.0.5/lib/rails/commands.rb:28:in `require'
from /Library/Ruby/Gems/1.8/gems/railties-3.0.5/lib/rails/commands.rb:28
from /Library/Ruby/Gems/1.8/gems/railties-3.0.5/lib/rails/commands.rb:27:in `tap'
from /Library/Ruby/Gems/1.8/gems/railties-3.0.5/lib/rails/commands.rb:27
from script/rails:6:in `require'
from script/rails:6
I guess it's a problem of my environment, but I don't know how to solve it.
Please help me, thanks!!
mikhailov ask me to paste my Gemfile and Gemfile.lock.
Here it is:
Gemfile:
source 'http://rubygems.org'
gem 'rails', '3.0.5'
gem 'sqlite3-ruby', :require => 'sqlite3'
gem 'redis'
gem 'SystemTimer'
Gemfile.lock:
GEM
remote: http://rubygems.org/
specs:
abstract (1.0.0)
actionmailer (3.0.5)
actionpack (= 3.0.5)
mail (~> 2.2.15)
actionpack (3.0.5)
activemodel (= 3.0.5)
activesupport (= 3.0.5)
builder (~> 2.1.2)
erubis (~> 2.6.6)
i18n (~> 0.4)
rack (~> 1.2.1)
rack-mount (~> 0.6.13)
rack-test (~> 0.5.7)
tzinfo (~> 0.3.23)
activemodel (3.0.5)
activesupport (= 3.0.5)
builder (~> 2.1.2)
i18n (~> 0.4)
activerecord (3.0.5)
activemodel (= 3.0.5)
activesupport (= 3.0.5)
arel (~> 2.0.2)
tzinfo (~> 0.3.23)
activeresource (3.0.5)
activemodel (= 3.0.5)
activesupport (= 3.0.5)
activesupport (3.0.5)
arel (2.0.9)
builder (2.1.2)
erubis (2.6.6)
abstract (>= 1.0.0)
i18n (0.5.0)
mail (2.2.15)
activesupport (>= 2.3.6)
i18n (>= 0.4.0)
mime-types (~> 1.16)
treetop (~> 1.4.8)
mime-types (1.16)
polyglot (0.3.1)
rack (1.2.2)
rack-mount (0.6.14)
rack (>= 1.0.0)
rack-test (0.5.7)
rack (>= 1.0)
rails (3.0.5)
actionmailer (= 3.0.5)
actionpack (= 3.0.5)
activerecord (= 3.0.5)
activeresource (= 3.0.5)
activesupport (= 3.0.5)
bundler (~> 1.0)
railties (= 3.0.5)
railties (3.0.5)
actionpack (= 3.0.5)
activesupport (= 3.0.5)
rake (>= 0.8.7)
thor (~> 0.14.4)
rake (0.9.2)
redis (2.2.2)
sqlite3-ruby (1.2.4)
thor (0.14.6)
treetop (1.4.9)
polyglot (>= 0.3.1)
tzinfo (0.3.25)
PLATFORMS
ruby
DEPENDENCIES
rails (= 3.0.5)
redis
sqlite3-ruby

Answer 1

You still should use/try:
bundle exec rake resque:work QUEUE=*

Answer 2

Resque has dependence on 'json' gem, so just add it into Gemfile:
gem 'json'
then Bundler pick the appropriate version to resolve dependencies