MSF 3.0 Beta error

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Not sure what the problem is here, I have tried different things including 
compiling ruby from source, but I still cant figure out what is causing this 
error. Im trying to use version 3 framework on a new install of CentOS 
Server, but for some reson it keeps giving me the following error. Any 
Ideas?


[root at xeon framework-3.0-beta-1]# ./msfconsole
./lib/rex/text.rb:3:in `require': No such file to load -- stringio 
(LoadError)
        from ./lib/rex/text.rb:3
        from ./lib/rex.rb:10:in `require'
        from ./lib/rex.rb:10
        from ./msfconsole:10:in `require'
        from ./msfconsole:10
[root at xeon framework-3.0-beta-1]#

Thanks again.

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