Trying to add monitors to a monitor group

[jasmeralia]

#!/opt/chefdk/embedded/bin/ruby

require 'bundler/inline'

gemfile do
  source 'https://rubygems.org'
  gem 'site24x7client', git: 'https://github.com/danvideo/site24x7client'
  gem 'optimist'
  gem 'inifile'
  gem 'rest-client'
end

require 'pp'
require 'site24x7client'
require 'rest-client'
require 'optimist'
require 'inifile'
require 'json'

whoami = `whoami`.chomp
# parse the command line options
opts = Optimist.options do
  opt :token,   'Site 24x7 token value', type: :string, short: 't', required: false, default: ENV['SITE24X7_TOKEN']
  opt :group,   'Monitor group to tag monitors into', type: :string, short: 'g', required: false, default: 'Concierge'
  opt :search,  'Search string for monitors to tag', type: :string, short: 's', required: true
  opt :verbose, 'Verbose', type: :boolean, default: true, short: 'v', required: false
end

begin
  # Establish connection to Site 24x7 API
  client = Site24x7client::Client.new(access_token: opts[:token])
  mgroupid = 0

  client.monitor_groups.all.each do |mgroup|
    next if mgroup.display_name.nil?
    if mgroup.display_name.include?(opts[:group])
      mgroupid = mgroup.group_id
      puts "#{mgroup.display_name} id is #{mgroupid}"
    end
  end

  if mgroupid == 0
    puts "Unable to find a monitor group matching '#{opts[:group]}'"
    exit 1
  end

  client.monitors.all.each do |monitor|
    # <Site24x7client::Monitor {:@monitor_id=>"83611000025870031", :@display_name=>"NVA SSO Lobby API About Page", :@type=>"URL", :@website=>"https://lobby.gomoxie.solutions/master/about", :@check_frequency=>"5", :@timeout=>15, :@location_profile_id=>"83611000002423006", :@notification_profile_id=>"83611000021314001", :@threshold_profile_id=>"83611000002423008", :@user_group_ids=>["83611000000267003", "83611000025855097"], :@http_method=>"G", :@use_ipv6=>false, :@matching_keyword=>{"value"=>"Build number", "severity"=>2}, :@monitor_groups=>["83611000025870029"], :@up_status_codes=>nil}>
    next if monitor.display_name.nil?
    if monitor.display_name.include?(opts[:search])
      mid = monitor.monitor_id
      puts "Adding monitor #{mid} to monitor group #{mgroupid}..."
      monitor.monitor_groups = [mgroupid]
      client.monitors.update(monitor, mid)
      pp monitor if opts[:verbose]
      puts "\n"
    end
  end
rescue StandardError => e
  $stderr.puts "Error communicating with Site 24x7: #{e.message}"
  $stderr.puts e.backtrace
  exit 1
end

I'm getting the following output:

[nclemons@ryder site24x7 (DEVOPS-1797)]$ ./site24x7_tag_monitors -s ircon180event
Concierge-Production id is 83611000002423001
Adding monitor 83611000026313085 to monitor group 83611000002423001...
Error communicating with Site 24x7: 404: {"error_code":1009,"message":"Invalid URL."}    

/Users/nclemons/.chefdk/gem/ruby/2.4.0/bundler/gems/site24x7client-b45b2a92521b/lib/site24x7client/error_handling_resourcable.rb:8:in `block (2 levels) in included'
/opt/chefdk/embedded/lib/ruby/gems/2.4.0/gems/resource_kit-0.1.7/lib/resource_kit/action_invoker.rb:19:in `instance_exec'
/opt/chefdk/embedded/lib/ruby/gems/2.4.0/gems/resource_kit-0.1.7/lib/resource_kit/action_invoker.rb:19:in `handle_response'
/opt/chefdk/embedded/lib/ruby/gems/2.4.0/gems/resource_kit-0.1.7/lib/resource_kit/action_invoker.rb:14:in `call'
/opt/chefdk/embedded/lib/ruby/gems/2.4.0/gems/resource_kit-0.1.7/lib/resource_kit/method_factory.rb:16:in `block in method_for_action'
./site24x7_tag_monitors:54:in `block in <main>'
./site24x7_tag_monitors:47:in `each'
./site24x7_tag_monitors:47:in `<main>'
[nclemons@ryder site24x7 (DEVOPS-1797)]$ 

Any advice as to what I'm doing wrong would be appreciated.