Error installing rubygems

I get the following error when trying to install rubygems version 1.3.7

$ ruby setup.rb 
ERROR:  While executing gem ... (Errno::EACCES)
   Permission denied - /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/gem

Any idea what is cause this. I've previously installed RVM.



Run the command

sudo !!

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