Error with autotest in ruby on rails

Question

I ran the command autotest and this is the error I got . I am following Hartl's book and was wondering is this clash happening because rails now comes with ZenTest or something else ? How can I work past this error. I am new to RoR

Invalid gemspec in [/Users//.rvm/gems/ruby-1.9.2-p320@twitclone/specifications/ZenTest-4.8.4.gemspec]: Illformed requirement ["< 2.1, >= 1.8"]
Invalid gemspec in [/Users//.rvm/gems/ruby-1.9.2-p320@twitclone/specifications/ZenTest-4.8.4.gemspec]: Illformed requirement ["< 2.1, >= 1.8"]
/Users//.rvm/rubies/ruby-1.9.2-p320/lib/ruby/site_ruby/1.9.1/rubygems/dependency.rb:247:in `to_specs': Could not find ZenTest (>= 0) amongst [abstract-1.0.0, actionmailer-3.2.8, actionmailer-3.2.8.rc1, actionmailer-3.0.1, actionmailer-3.0.0, actionpack-3.2.8, actionpack-3.2.8.rc1, actionpack-3.0.1, actionpack-3.0.0, activemodel-3.2.8, activemodel-3.2.8.rc1, activemodel-3.0.1, activemodel-3.0.0, activerecord-3.2.8, activerecord-3.2.8.rc1, activerecord-3.0.1, activerecord-3.0.0, activeresource-3.2.8, activeresource-3.2.8.rc1, activeresource-3.0.1, activeresource-3.0.0, activesupport-3.2.8, activesupport-3.2.8.rc1, activesupport-3.0.1, activesupport-3.0.0, addressable-2.3.2, arel-3.0.2, arel-1.0.1, autotest-4.4.6, builder-3.0.4, builder-3.0.3, builder-2.1.2, bundler-1.2.1, bundler-1.2.0, bundler-1.0.22, coffee-rails-3.2.2, coffee-script-2.2.0, coffee-script-source-1.4.0, coffee-script-source-1.3.3, diff-lcs-1.1.3, erubis-2.7.0, erubis-2.6.6, excon-0.16.2, execjs-1.4.0, heroku-2.31.2, heroku-api-0.3.5, hike-1.2.1, i18n-0.6.1, i18n-0.4.2, journey-1.0.4, jquery-rails-2.1.4, jquery-rails-2.1.2, json-1.7.5, launchy-2.1.2, mail-2.4.4, mail-2.2.19, mime-types-1.19, multi_json-1.4.0, multi_json-1.3.6, netrc-0.7.7, polyglot-0.3.3, rack-1.4.1, rack-1.2.5, rack-cache-1.2, rack-mount-0.6.14, rack-ssl-1.3.2, rack-test-0.6.2, rack-test-0.6.1, rack-test-0.5.7, rails-3.2.8, rails-3.2.8.rc1, rails-3.0.1, railties-3.2.8, railties-3.2.8.rc1, railties-3.0.1, railties-3.0.0, rake-10.0.2, rake-0.9.2.2, rdoc-3.12, rest-client-1.6.7, rspec-2.12.0, rspec-core-2.12.1, rspec-expectations-2.12.0, rspec-mocks-2.12.0, rspec-rails-2.12.0, rubygems-bundler-1.1.0, rubyzip-0.9.9, rvm-1.11.3.5, sass-3.2.3, sass-3.2.1, sass-rails-3.2.5, sequel-3.20.0, sinatra-1.0, spork-0.9.2, spork-0.9.0, sprockets-2.1.3, sqlite3-1.3.6, taps-0.3.24, thor-0.16.0, thor-0.14.6, tilt-1.3.3, treetop-1.4.12, treetop-1.4.10, tzinfo-0.3.35, tzinfo-0.3.33, uglifier-1.3.0] (Gem::LoadError)
from /Users//.rvm/rubies/ruby-1.9.2-p320/lib/ruby/site_ruby/1.9.1/rubygems/dependency.rb:256:in `to_spec'
from /Users//.rvm/rubies/ruby-1.9.2-p320/lib/ruby/site_ruby/1.9.1/rubygems.rb:1231:in `gem'
from /Users//.rvm/gems/ruby-1.9.2-p320@twitclone/bin/autotest:18:in `<main>'
from /Users//.rvm/gems/ruby-1.9.2-p320@twitclone/bin/ruby_noexec_wrapper:14:in `eval'
from /Users//.rvm/gems/ruby-1.9.2-p320@twitclone/bin/ruby_noexec_wrapper:14:in `<main>'

So after the answer suggested , I tried to uninstall Zentest first

-MacBook-Pro:proto1 $ gem uninstall ZenTest-4.8.4
Invalid gemspec in [/Users//.rvm/gems/ruby-1.9.2-p320@twitclone/specifications/ZenTest-4.8.4.gemspec]: Illformed requirement ["< 2.1, >= 1.8"]
Invalid gemspec in [/Users//.rvm/gems/ruby-1.9.2-p320@twitclone/specifications/ZenTest-4.8.4.gemspec]: Illformed requirement ["< 2.1, >= 1.8"]
INFO:  gem "ZenTest-4.8.4" is not installed

After this ( inspite of the error messages , I installed the downgrade version )

s-MacBook-Pro:proto1 $ gem install ZenTest --version "=4.8.3"
Invalid gemspec in [/Users//.rvm/gems/ruby-1.9.2-p320@twitclone/specifications/ZenTest-4.8.4.gemspec]: Illformed requirement ["< 2.1, >= 1.8"]
Invalid gemspec in [/Users//.rvm/gems/ruby-1.9.2-p320@twitclone/specifications/ZenTest-4.8.4.gemspec]: Illformed requirement ["< 2.1, >= 1.8"]
Fetching: ZenTest-4.8.3.gem (100%)
Invalid gemspec in [/Users//.rvm/gems/ruby-1.9.2-p320@twitclone/specifications/ZenTest-4.8.4.gemspec]: Illformed requirement ["< 2.1, >= 1.8"]
Successfully installed ZenTest-4.8.3
1 gem installed
Invalid gemspec in [/Users//.rvm/gems/ruby-1.9.2-p320@twitclone/specifications/ZenTest-4.8.4.gemspec]: Illformed requirement ["< 2.1, >= 1.8"]
Installing ri documentation for ZenTest-4.8.3...
Installing RDoc documentation for ZenTest-4.8.3...

And then I run autotest with this showing up !

s-MacBook-Pro:proto1 $ autotest
Invalid gemspec in [/Users//.rvm/gems/ruby-1.9.2-p320@twitclone/specifications/ZenTest-4.8.4.gemspec]: Illformed requirement ["< 2.1, >= 1.8"]
Invalid gemspec in [/Users//.rvm/gems/ruby-1.9.2-p320@twitclone/specifications/ZenTest-4.8.4.gemspec]: Illformed requirement ["< 2.1, >= 1.8"]
loading autotest/rspec2

New part of the problem :

After I was suggested to delete ZenTest gemspec file , I cannot run spork or the rails server . I have installed ZenTest 4.8.3 but it's showing the following thing :

$ spork
Using RSpec
Preloading Rails environment
Could not find ZenTest-4.8.4 in any of the sources
Run `bundle install` to install missing gems.

Answer 1

To use the command autotest you have to install the ZenTest gem.
I think you had installed ZenTest 4.8.4 in your system. this gem is not working properly.
So you have to downgrade it to 4.8.3. Remove all the the files related to ZenTest 4.8.4. then install 4.8.3 using the command

gem install ZenTest --version "=4.8.3"

I think this will solve you problem.

Cheers..!