undefined method 'each' when trying to create a ethernet connection

[dannythk]

Used the sample ethernet connection from the README:

networkmanager::ifc::connection {
  'z1':
    ensure         => present,
    mac_address    => '52:54:00:4d:2a:56',
    ipv4_method    => 'manual',
    ipv4_address   => '192.168.1.12/24,192.168.1.1',
    ipv4_dns       => '8.8.8.8;8.8.4.4;',
    ipv6_method    => 'manual',
    ipv6_dhcp_duid => '00:22:66::52:54:10:44:2a:56'
    ipv6_address   => 'IPV6ADDRESS/PREFIX',
    ipv6_dns       => 'IPV6DNS1;IPV6DNS2;'
    ipv6_gateway   => 'IPV6GATEWAY';
}

I fixed the id to meet the requirement, set ipv6_method to ignore and removed the rest of the ipv6 configuration. Put in the interface_name. I can't get it to work. I get the error when it iterated through to get the keyfile_content.

$keyfile_contents = deep_merge(
      $interface_name_config,
      $master_config,
      $connection_config,
      $mac_config,
      $ipv4_config,
      $ipv4_may_fail_config,
      $ipv4_gw_config,
      $ipv4_address_config,
      $ipv4_dns_config,
      $ipv6_config,
      $ipv6_may_fail_config,
      $ipv6_gw_config,
      $ipv6_address_config,
      $ipv6_dns_config,
      $ipv6_duid_config,
      $additional_config
    )

It complained: Error while evaluating a Function Call, undefined method each for "":String

Trying to figure out what is the difference between this and the bond connection. I am able to get the bond one to work without any issue.