Homestead 启动时出现 homestead.rb:358:in `+': no implicit conversion of Hash into String (TypeError) ？

$ vagrant up
C:/Users/Administrator/Homestead/scripts/homestead.rb:358:in `+': no implicit conversion of Hash into String (TypeError)
        from C:/Users/Administrator/Homestead/scripts/homestead.rb:358:in `block (2 levels) in configure'
        from E:/vagrant/embedded/gems/2.1.1/gems/vagrant-2.1.1/plugins/kernel_v2/config/vm_provisioner.rb:82:in `add_config'
        from E:/vagrant/embedded/gems/2.1.1/gems/vagrant-2.1.1/plugins/kernel_v2/config/vm.rb:336:in `provision'
        from C:/Users/Administrator/Homestead/scripts/homestead.rb:357:in `block in configure'
        from C:/Users/Administrator/Homestead/scripts/homestead.rb:356:in `each'
        from C:/Users/Administrator/Homestead/scripts/homestead.rb:356:in `configure'
        from C:/Users/Administrator/Homestead/Vagrantfile:35:in `block in <top (required)>'
        from E:/vagrant/embedded/gems/2.1.1/gems/vagrant-2.1.1/lib/vagrant/config/v2/loader.rb:37:in `load'
        from E:/vagrant/embedded/gems/2.1.1/gems/vagrant-2.1.1/lib/vagrant/config/loader.rb:126:in `block (2 levels) in load'
        from E:/vagrant/embedded/gems/2.1.1/gems/vagrant-2.1.1/lib/vagrant/config/loader.rb:119:in `each'
        from E:/vagrant/embedded/gems/2.1.1/gems/vagrant-2.1.1/lib/vagrant/config/loader.rb:119:in `block in load'
        from E:/vagrant/embedded/gems/2.1.1/gems/vagrant-2.1.1/lib/vagrant/config/loader.rb:116:in `each'
        from E:/vagrant/embedded/gems/2.1.1/gems/vagrant-2.1.1/lib/vagrant/config/loader.rb:116:in `load'
        from E:/vagrant/embedded/gems/2.1.1/gems/vagrant-2.1.1/lib/vagrant/vagrantfile.rb:28:in `initialize'
        from E:/vagrant/embedded/gems/2.1.1/gems/vagrant-2.1.1/lib/vagrant/environment.rb:777:in `new'
        from E:/vagrant/embedded/gems/2.1.1/gems/vagrant-2.1.1/lib/vagrant/environment.rb:777:in `vagrantfile'
        from E:/vagrant/embedded/gems/2.1.1/gems/vagrant-2.1.1/lib/vagrant/environment.rb:523:in `host'
        from E:/vagrant/embedded/gems/2.1.1/gems/vagrant-2.1.1/lib/vagrant/environment.rb:191:in `block in action_runner'
        from E:/vagrant/embedded/gems/2.1.1/gems/vagrant-2.1.1/lib/vagrant/action/runner.rb:33:in `run'
        from E:/vagrant/embedded/gems/2.1.1/gems/vagrant-2.1.1/lib/vagrant/environment.rb:510:in `hook'
        from E:/vagrant/embedded/gems/2.1.1/gems/vagrant-2.1.1/lib/vagrant/environment.rb:759:in `unload'
        from E:/vagrant/embedded/gems/2.1.1/gems/vagrant-2.1.1/bin/vagrant:159:in `ensure in <main>'
        from E:/vagrant/embedded/gems/2.1.1/gems/vagrant-2.1.1/bin/vagrant:159:in `<main>'

请问大家这个怎么处理呢。