kali BEEF-XSS启动报错解决

kali Linux自带BEEF框架，长时间搁置后启动报错：

root@kali:/usr/share/beef-xss# ./beef

Traceback (most recent call last):

　　14: from ./beef:32:in `<main>'

　　13: from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'

　　12: from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'

　　11: from /usr/share/beef-xss/core/loader.rb:16:in `<top (required)>'

　　10: from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'

　　9: from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'

　　8: from /usr/lib/ruby/vendor_ruby/rubydns.rb:23:in `<top (required)>'

　　7: from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'

　　6: from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'

　　5: from /usr/lib/ruby/vendor_ruby/rubydns/message.rb:21:in `<top (required)>'

　　4: from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'

　　3: from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'

　　2: from /usr/lib/ruby/vendor_ruby/eventmachine.rb:8:in `<top (required)>'

　　1: from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'

　　/usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require': cannot load such file -- rubyeventmachine (LoadError)

解决方法：

卸载beef，ruby

#apt remove ruby

#apt remove beef-xss

#apt-get install ruby

#apt-get install ruby-dev libpcap-dev

#gem install eventmachine

#apt-get install beef-xss

问题解决，重新启动BEEF无报错