Homesteadを使いたいのですが、vagrant upで「no implicit conversion of nil into String (TypeError)」とエラーが出ます

前提・実現したいこと

これまでXAMPPでLaravelを勉強しておりました。
今回、初めてHomesteadを用いたLaravelの環境構築を試しているのですが、途中でエラーが出て進めず悩んでいます。

VirtualBoxのインストール
Vagrantのインストール
vagrant box add laravel/homesteadでHomestead Vagrant Boxをインストール
git clone https://github.com/laravel/homestead.git ~/HomesteadでHomesteadをインストール
Homesteadディレクトリでgit checkout release bash init .sh
ユーザーディレクトリ下（C:\Users\xxx\）にcodeディレクトリを作成
Homestead.yamlファイルの「folders: - map:」のパスを「C:\Users\xxx\code」に書き換えて保存
vagrant upという手順で行いました。

発生している問題・エラーメッセージ

以下のエラーメッセージが出ます。

xxx@yyy MINGW64 ~/Homestead (release)
$ vagrant up
Bringing machine 'homestead' up with 'virtualbox' provider...
==> homestead: [vagrant-hostsupdater] Checking for host entries
C:/Users/xxx/.vagrant.d/gems/2.6.6/gems/vagrant-hostsupdater-1.1.1.160/lib/vagrant-hostsupdater/HostsUpdater.rb:126:in `digest': no implicit conversion of nil into String (TypeError)
        from C:/Users/xxx/.vagrant.d/gems/2.6.6/gems/vagrant-hostsupdater-1.1.1.160/lib/vagrant-hostsupdater/HostsUpdater.rb:126:in `hexdigest'
        from C:/Users/xxx/.vagrant.d/gems/2.6.6/gems/vagrant-hostsupdater-1.1.1.160/lib/vagrant-hostsupdater/HostsUpdater.rb:126:in `signature'
        from C:/Users/xxx/.vagrant.d/gems/2.6.6/gems/vagrant-hostsupdater-1.1.1.160/lib/vagrant-hostsupdater/HostsUpdater.rb:73:in `createHostEntry'
        from C:/Users/xxx/.vagrant.d/gems/2.6.6/gems/vagrant-hostsupdater-1.1.1.160/lib/vagrant-hostsupdater/HostsUpdater.rb:42:in `block (2 levels) in addHostEntries'
        from C:/Users/xxx/.vagrant.d/gems/2.6.6/gems/vagrant-hostsupdater-1.1.1.160/lib/vagrant-hostsupdater/HostsUpdater.rb:36:in `each'
        from C:/Users/xxx/.vagrant.d/gems/2.6.6/gems/vagrant-hostsupdater-1.1.1.160/lib/vagrant-hostsupdater/HostsUpdater.rb:36:in `block in addHostEntries'
        from C:/Users/xxx/.vagrant.d/gems/2.6.6/gems/vagrant-hostsupdater-1.1.1.160/lib/vagrant-hostsupdater/HostsUpdater.rb:35:in `each'
        from C:/Users/xxx/.vagrant.d/gems/2.6.6/gems/vagrant-hostsupdater-1.1.1.160/lib/vagrant-hostsupdater/HostsUpdater.rb:35:in `addHostEntries'
        from C:/Users/xxx/.vagrant.d/gems/2.6.6/gems/vagrant-hostsupdater-1.1.1.160/lib/vagrant-hostsupdater/Action/UpdateHosts.rb:17:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/2.2.14/gems/vagrant-2.2.14/lib/vagrant/action/warden.rb:48:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/2.2.14/gems/vagrant-2.2.14/plugins/commands/up/middleware/store_box_metadata.rb:33:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/2.2.14/gems/vagrant-2.2.14/lib/vagrant/action/warden.rb:48:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/2.2.14/gems/vagrant-2.2.14/plugins/providers/virtualbox/action/created.rb:15:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/2.2.14/gems/vagrant-2.2.14/lib/vagrant/action/warden.rb:48:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/2.2.14/gems/vagrant-2.2.14/lib/vagrant/action/builder.rb:149:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/2.2.14/gems/vagrant-2.2.14/lib/vagrant/action/runner.rb:89:in `block in run'
        from C:/HashiCorp/Vagrant/embedded/gems/2.2.14/gems/vagrant-2.2.14/lib/vagrant/util/busy.rb:19:in `busy'
        from C:/HashiCorp/Vagrant/embedded/gems/2.2.14/gems/vagrant-2.2.14/lib/vagrant/action/runner.rb:89:in `run'
        from C:/HashiCorp/Vagrant/embedded/gems/2.2.14/gems/vagrant-2.2.14/lib/vagrant/action/builtin/call.rb:43:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/2.2.14/gems/vagrant-2.2.14/lib/vagrant/action/warden.rb:48:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/2.2.14/gems/vagrant-2.2.14/plugins/providers/virtualbox/action/check_virtualbox.rb:26:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/2.2.14/gems/vagrant-2.2.14/lib/vagrant/action/warden.rb:48:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/2.2.14/gems/vagrant-2.2.14/lib/vagrant/action/builder.rb:149:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/2.2.14/gems/vagrant-2.2.14/lib/vagrant/action/runner.rb:89:in `block in run'
        from C:/HashiCorp/Vagrant/embedded/gems/2.2.14/gems/vagrant-2.2.14/lib/vagrant/util/busy.rb:19:in `busy'
        from C:/HashiCorp/Vagrant/embedded/gems/2.2.14/gems/vagrant-2.2.14/lib/vagrant/action/runner.rb:89:in `run'
        from C:/HashiCorp/Vagrant/embedded/gems/2.2.14/gems/vagrant-2.2.14/lib/vagrant/machine.rb:246:in `action_raw'
        from C:/HashiCorp/Vagrant/embedded/gems/2.2.14/gems/vagrant-2.2.14/lib/vagrant/machine.rb:215:in `block in action'
        from C:/HashiCorp/Vagrant/embedded/gems/2.2.14/gems/vagrant-2.2.14/lib/vagrant/environment.rb:613:in `lock'
        from C:/HashiCorp/Vagrant/embedded/gems/2.2.14/gems/vagrant-2.2.14/lib/vagrant/machine.rb:201:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/2.2.14/gems/vagrant-2.2.14/lib/vagrant/machine.rb:201:in `action'
        from C:/HashiCorp/Vagrant/embedded/gems/2.2.14/gems/vagrant-2.2.14/lib/vagrant/batch_action.rb:86:in `block (2 levels) in run'

Homestead.yamlの内容

---
ip: "192.168.10.10"
memory: 2048
cpus: 2
provider: virtualbox

authorize: ~/.ssh/id_rsa.pub

keys:
    - ~/.ssh/id_rsa

folders:
    - map: C:\Users\xxx\code
      to: /home/vagrant/code

sites:
    - map: homestead.test
      to: /home/vagrant/code/public

databases:
    - homestead

features:
    - mysql: false
    - mariadb: false
    - ohmyzsh: false
    - webdriver: false

# ports:
#     - send: 50000
#       to: 5000
#     - send: 7777
#       to: 777
#       protocol: udp