Command "rhel-osp-installer" returns "invalid byte sequence in US-ASCII (ArgumentError)"

Issue

• Command rhel-osp-installer returns "invalid byte sequence in US-ASCII (ArgumentError)"
• Running rhel-osp-installer and the script finishes with the following error:

[root@openstack ]# rhel-osp-installer
/usr/share/gems/gems/highline-1.6.21/lib/highline.rb:724:in `gsub': invalid byte sequence in US-ASCII (ArgumentError)
    from /usr/share/gems/gems/highline-1.6.21/lib/highline.rb:724:in `format_statement'
    from /usr/share/gems/gems/highline-1.6.21/lib/highline.rb:617:in `say'
    from /usr/share/foreman-installer/hooks/lib/provisioning_wizard.rb:115:in `print_pair'
    from /usr/share/foreman-installer/hooks/lib/base_wizard.rb:81:in `block in print_configuration'
    from /usr/share/foreman-installer/hooks/lib/base_wizard.rb:78:in `each'
    from /usr/share/foreman-installer/hooks/lib/base_wizard.rb:78:in `print_configuration'
    from /usr/share/foreman-installer/hooks/lib/base_wizard.rb:37:in `start'
    from /usr/share/foreman-installer/hooks/lib/provisioning_wizard.rb:45:in `start'
    from /usr/share/foreman-installer/hooks/pre_validations/10-gather_and_set_staypuft_values.rb:6:in `block (4 levels) in load'
    from /usr/share/gems/gems/kafo-0.6.4/lib/kafo/hooking.rb:32:in `instance_eval'
    from /usr/share/gems/gems/kafo-0.6.4/lib/kafo/hooking.rb:32:in `block (4 levels) in load'
    from /usr/share/gems/gems/kafo-0.6.4/lib/kafo/hook_context.rb:13:in `instance_exec'
    from /usr/share/gems/gems/kafo-0.6.4/lib/kafo/hook_context.rb:13:in `execute'
    from /usr/share/gems/gems/kafo-0.6.4/lib/kafo/hooking.rb:48:in `block in execute'
    from /usr/share/gems/gems/kafo-0.6.4/lib/kafo/hooking.rb:47:in `each_pair'
    from /usr/share/gems/gems/kafo-0.6.4/lib/kafo/hooking.rb:47:in `execute'
    from /usr/share/gems/gems/kafo-0.6.4/lib/kafo/kafo_configure.rb:92:in `execute'
    from /usr/share/gems/gems/clamp-0.6.2/lib/clamp/command.rb:67:in `run'
    from /usr/share/gems/gems/clamp-0.6.2/lib/clamp/command.rb:125:in `run'
    from /usr/share/gems/gems/kafo-0.6.4/lib/kafo/kafo_configure.rb:116:in `run'
    from /usr/sbin/rhel-osp-installer:55:in `<main>'