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How to install "Fast Debugger" using Netbeans as IDE for Ruby?

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I'm using Netbeans 6.0 as IDE for Ruby coding.
When I try to debug some code, the following warning is shown:

For debugging applications under native Ruby interpreter, the Fast Debugger, which is available
as a gem, may be used. Do you want to install it now or continue with the dafault(slow) debugger?

I choose "Install" and the following message is shown:

Screen "Gem Installation"
ERROR: While executing gem ... (Gem::RemoteFetcher::FetchError)
Bad file descriptor - connect(2)(Errno::EBADF)

I also tried to install by command line, but the same error happens:

1. C:\ruby>gem install ruby-debug-ide
2. ERROR: While executing gem ... (Gem::RemoteFetcher::FetchError)
3. Bad file descriptor - connect(2)(Errno::EBADF)
5. C:\ruby>

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Are you using a proxy server? Try using the option --http-proxy or setting the HTTP_PROXY environment variable.
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