James,

While you didn't tell us know what OS you're running, I can see from
the
the "c\:" in the error report that its some flavor of Windows (XP,
Vista, Win7, etc.)

Make sure of the following:
a) You are Logged into Windows as a user with Administrative rights
b) If installing via the Ruby one-click-installer on Vista or Win7
    make sure that when you launch installer you select "run as
administrator"
c) If installing on Vista or Win7 make sure that when you launch the
    console window you select "run as administrator"
d) The user has recursive write permissions to their home directory.
    So the Ruby install can create it's %USERPROFILE%\.gem directory
    Some large organizations may lock down the permissions.
e) The user account is local to the system, not a roaming profile.
    Some large organizations may use roaming profiles which will
    complicate the install process, if you are using the same user
account
    to perform the installations om multiple systems. As the .gem
    folder from the 1st install may need to be hidden so that the
    next Ruby install does NOT use it.

You may want to a) uninstall the current failing Ruby installation,
b) manually remove any remaining %USERPROFILE%\.gem directory,
and then c) re-install making sure tofollow the tips listed above.

Joe

On Jun 18, 12:16 am, James <[email protected]> wrote:

> However, after I installed the ruby186-26, and run the command “gem
> update --system”, the following error occurred:
>
> C:\Documents and Settings\e482090\Desktop>gem update --system
> c:/ruby/lib/ruby/site_ruby/1.8/rubygems/config_file.rb:51:in
> `initialize': Inval
> id argument - <Not Set>/.gemrc (Errno::EINVAL)
>         from c:/ruby/lib/ruby/site_ruby/1.8/rubygems/config_file.rb:
> 51:in `open'
>
> Meanwhile, we have tried this on other machines and the result turned
> out ok.

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