[framework] broken encoder

[Blurred Logic]

I've tried this out of a fresh install of MSF 3beta 2 svn, updated,
reinstalled without updating, still receiving same errors.
Is it my system or has nobody tested this module yet?

msf > msfencode -n x86/unicode_mixed
/home/framework/lib/msf/core/module_manager.rb:86:in `+': can't convert nil
into String (TypeError)
        from /home/framework/lib/msf/core/module_manager.rb:86:in `create'
        from /home/framework/msfencode:135
msf >

Any suggestions would be appreciated, thanks.
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