Parrot OS KDE에서 Metasploit을 사용할 때 이 오류를 수정하는 방법

Traceback (most recent call last):
        5: from <internal:gem_prelude>:1:in `<internal:gem_prelude>'
        4: from <internal:gem_prelude>:1:in `require'
        3: from /usr/lib/ruby/vendor_ruby/rubygems.rb:1348:in `<top (required)>'
        2: from /usr/lib/ruby/vendor_ruby/rubygems.rb:1348:in `require'
        1: from /usr/lib/ruby/vendor_ruby/rubygems/defaults/operating_system.rb:49:in `<top (required)>'
/usr/lib/ruby/vendor_ruby/rubygems/defaults/operating_system.rb:50:in `<class:Specification>': undefined method `rubyforge_project=' for class `Gem::Specification' (NameError)