시작하면

underfined local variable or method `' for main:Object
Vocab:1:in `<main>'
main:163:in `eval'
main:163:in `block in <main>'
main:161:in `each'
main:161:in `<main>'
(eval):94:in `eval'
(eval):94:in `require_'
(eval):105:in `require'
(eval):1:in `<main>'

이게 뜨면서 안됩니다
어떻게하나요?