Forum: Ruby on Rails Rails / Rack version mismatch

I attempted to install rails, with these error messages:

$ sudo gem install rails
ERROR:  Error installing rails:
  actionpack requires rack (~> 1.0.0, runtime)

$ sudo gem install rack
Successfully installed rack-1.1.0
1 gem installed

$ sudo gem install rails
ERROR:  Error installing rails:
  actionpack requires rack (~> 1.0.0, runtime)

Why does gem install a current version of rack which is incompatible
with the current version of rails? Moreover, why doesn't install of
rails include the proper rack dependency?

On Feb 4, 2010, at 9:28 AM, RonL wrote:

> I attempted to install rails, with these error messages:
>
> $ sudo gem install rails
> ERROR:  Error installing rails:
>   actionpack requires rack (~> 1.0.0, runtime)
>
> $ sudo gem install rack
> Successfully installed rack-1.1.0
> 1 gem installed

Try installing rack 1.0.1

~> 1.0.0 means ">= 1.0.0" && "< 1.1"

However, 1.1.0 is not "< 1.1"

irb> req=Gem::Requirement.new("~>1.0.0")
=> #<Gem::Requirement:0x641ae0 @requirements=[["~>", #<Gem::Version
"1.0.0">]], @version=nil>
irb> req.satisfied_by? Gem::Version.new("1.0.1")
=> true
irb> req.satisfied_by? Gem::Version.new("1.1.0")
=> false

-Rob

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Rob Biedenharn    http://agileconsultingllc.com
Rob@AgileConsultingLLC.com

Did you get this solved I have similar issue and am stuck

Sean wrote:
> Did you get this solved I have similar issue and am stuck

i got past this  by installing rake =)
sudo gem install rake