Attribute (keyring) does not pass the type constraint on login

[fwag]

$ kanku login -a https://URL
Attribute (keyring) does not pass the type constraint because: Validation failed for 'KeyringBackend' with value "". Value must be equal to "Gnome", "KDEWallet", "Memory", or "None". at constructor Kanku::Cli::Login::new (defined at /usr/lib/kanku/lib/Kanku/Cli/Login.pm line 86) line 128
	Kanku::Cli::Login::new('Kanku::Cli::Login', 'user', '', 'api_config', '/home/ta/.kankurc', 'password', '', 'apiurl', 'https://URL', 'keyring', '', 'extra_argv', 'ARRAY(0x55d37144c970)') called at /usr/lib/perl5/vendor_perl/5.40.0/MooseX/App/Role/Base.pm line 78
	MooseX::App::Role::Base::initialize_command_class('Kanku::Cli', 'Kanku::Cli::Login') called at /usr/lib/perl5/vendor_perl/5.40.0/MooseX/App/Plugin/BashCompletion.pm line 23
	Class::MOP::Class:::around('CODE(0x55d37085f1f8)', 'Kanku::Cli', 'Kanku::Cli::Login') called at /usr/lib/perl5/vendor_perl/5.40.0/x86_64-linux-thread-multi/Class/MOP/Method/Wrapped.pm line 166
	Kanku::Cli::_wrapped_initialize_command_class('Kanku::Cli', 'Kanku::Cli::Login') called at /usr/lib/perl5/vendor_perl/5.40.0/x86_64-linux-thread-multi/Class/MOP/Method/Wrapped.pm line 97
	Kanku::Cli::initialize_command_class('Kanku::Cli', 'Kanku::Cli::Login') called at /usr/lib/perl5/vendor_perl/5.40.0/MooseX/App.pm line 153
	MooseX::App::new_with_command('Kanku::Cli') called at /usr/bin/kanku line 18