Copy IPSETs from one NSX DFW to another

ipsets.rb

require 'curb'
require 'pp'
require 'json'
require 'active_support/all'

def curl(u,p,url,action,xml="")
  c = Curl::Easy.new(url)
  c.http_auth_types = :basic
  c.username = u
  c.password = p
  c.ssl_verify_peer = false
  c.verbose = false
  c.use_ssl = 3
  c.ssl_version = 3
  c.follow_location = true
  c.max_redirects = 3
  c.headers['Accept'] = 'application/json'
  c.headers['Content-Type'] = 'application/xml'
  c.post_body = xml if action == "http_post"
  c.put_data = xml if action == "http_put"
  c.send(action)
  c
end

p = "password"
u = "username"
lab = "lab_host"
cert = "cert_host"
prod = "prod_host"

from_nsx = prod
to_nsx = cert


@from_host = "https://#{prod}"
@to_host = "https://#{cert}"

@get_ipsets = "/api/2.0/services/ipset/scope/globalroot-0"
@post_ipset = "/api/2.0/services/ipset/globalroot-0"

all = JSON.parse(curl(u, p , "#{@from_host}#{@get_ipsets}", "perform").body_str)

all.each do |ipset|
  new_ipset = Hash.new
  %w(name value description).each { |x| new_ipset[x] = ipset[x] }
  new_ipset['revision'] = 0
  xml = new_ipset.to_xml(:root => 'ipset')
  time = Benchmark.realtime do
    url = "#{@to_host}#{@post_ipset}"
    puts "-------------------------------------"
    puts "NAME #{ipset['name']}"
    response = curl(u, p, url, "http_post", xml)
    puts "RESPONSE #{response.response_code}"
    puts "ID #{response.header_str}"
  end
  puts "Time elapsed #{time} seconds"
end

Hi trying to run this file but I get error..

C:/Ruby24/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:55:in require': ca nnot load such file -- curb (LoadError) from C:/Ruby24/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:55:in require'
from IPSETs.rb:1:in `

'

How can I run it