Ruby on Rails, netbeans - glassfish

Caute, nejde mi spustit ruby skript ukazkovy, cerstvo nainstalovany ruby plugin v netbeans mam, zrejme nejde server nwm preco. Tu je screen s chybou:
http://i50.tinypic.com/2rw3x1y.png
server log je prazdny.

a netbeans pise chybu:

SEVERE: library `socket' could not be loaded: java.lang.LinkageError: loader (instance of java/net/URLClassLoader): attempted duplicate class definition for name: "org/jruby/ext/socket/RubySocket"

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server ide, ale nieco mas zle nakonfigurovane. Ked v netbeanse kliknes na chybu, obvykle ta hodi na to miesto, kde to nastalo. Aj ked toto asi nebude ten pripad, ale skusit mozes.