puppet / puppet module build fails with ruby null error

puppet module build --help

/Users/samm/.rvm/gems/ruby-2.4.1/gems/puppet-4.10.0/lib/puppet/util/monkey_patches.rb:104:in `<class:SSLContext>': undefined method `<<' for nil:NilClass (NoMethodError)

	from /Users/samm/.rvm/gems/ruby-2.4.1/gems/puppet-4.10.0/lib/puppet/util/monkey_patches.rb:98:in `<top (required)>'

	from /Users/samm/.rvm/gems/ruby-2.4.1/gems/puppet-4.10.0/lib/puppet/util.rb:17:in `require'

	from /Users/samm/.rvm/gems/ruby-2.4.1/gems/puppet-4.10.0/lib/puppet/util.rb:17:in `<module:Util>'

	from /Users/samm/.rvm/gems/ruby-2.4.1/gems/puppet-4.10.0/lib/puppet/util.rb:16:in `<module:Puppet>'

	from /Users/samm/.rvm/gems/ruby-2.4.1/gems/puppet-4.10.0/lib/puppet/util.rb:15:in `<top (required)>'

	from /Users/samm/.rvm/gems/ruby-2.4.1/gems/puppet-4.10.0/lib/puppet.rb:14:in `require'

	from /Users/samm/.rvm/gems/ruby-2.4.1/gems/puppet-4.10.0/lib/puppet.rb:14:in `<top (required)>'

	from /Users/samm/.rvm/gems/ruby-2.4.1/gems/puppet-4.10.0/lib/puppet/util/command_line.rb:12:in `require'

	from /Users/samm/.rvm/gems/ruby-2.4.1/gems/puppet-4.10.0/lib/puppet/util/command_line.rb:12:in `<top (required)>'

	from /Users/samm/.rvm/gems/ruby-2.4.1/gems/puppet-4.10.0/bin/puppet:4:in `require'

	from /Users/samm/.rvm/gems/ruby-2.4.1/gems/puppet-4.10.0/bin/puppet:4:in `<top (required)>'

	from /usr/local/bin/puppet:23:in `load'

	from /usr/local/bin/puppet:23:in `<main>'

	from /Users/samm/.rvm/gems/ruby-2.4.1/bin/ruby_executable_hooks:15:in `eval'

	from /Users/samm/.rvm/gems/ruby-2.4.1/bin/ruby_executable_hooks:15:in `<main>'

puppet --version

/Users/samm/.rvm/gems/ruby-2.4.1/gems/puppet-4.10.0/lib/puppet/util/monkey_patches.rb:104:in `<class:SSLContext>': undefined method `<<' for nil:NilClass (NoMethodError)

	from /Users/samm/.rvm/gems/ruby-2.4.1/gems/puppet-4.10.0/lib/puppet/util/monkey_patches.rb:98:in `<top (required)>'

	from /Users/samm/.rvm/gems/ruby-2.4.1/gems/puppet-4.10.0/lib/puppet/util.rb:17:in `require'

	from /Users/samm/.rvm/gems/ruby-2.4.1/gems/puppet-4.10.0/lib/puppet/util.rb:17:in `<module:Util>'

	from /Users/samm/.rvm/gems/ruby-2.4.1/gems/puppet-4.10.0/lib/puppet/util.rb:16:in `<module:Puppet>'

	from /Users/samm/.rvm/gems/ruby-2.4.1/gems/puppet-4.10.0/lib/puppet/util.rb:15:in `<top (required)>'

	from /Users/samm/.rvm/gems/ruby-2.4.1/gems/puppet-4.10.0/lib/puppet.rb:14:in `require'

	from /Users/samm/.rvm/gems/ruby-2.4.1/gems/puppet-4.10.0/lib/puppet.rb:14:in `<top (required)>'

	from /Users/samm/.rvm/gems/ruby-2.4.1/gems/puppet-4.10.0/lib/puppet/util/command_line.rb:12:in `require'

	from /Users/samm/.rvm/gems/ruby-2.4.1/gems/puppet-4.10.0/lib/puppet/util/command_line.rb:12:in `<top (required)>'

	from /Users/samm/.rvm/gems/ruby-2.4.1/gems/puppet-4.10.0/bin/puppet:4:in `require'

	from /Users/samm/.rvm/gems/ruby-2.4.1/gems/puppet-4.10.0/bin/puppet:4:in `<top (required)>'

	from /usr/local/bin/puppet:23:in `load'

	from /usr/local/bin/puppet:23:in `<main>'

	from /Users/samm/.rvm/gems/ruby-2.4.1/bin/ruby_executable_hooks:15:in `eval'

	from /Users/samm/.rvm/gems/ruby-2.4.1/bin/ruby_executable_hooks:15:in `<main>'

gem list

*** LOCAL GEMS ***

ast (2.3.0)

bigdecimal (default: 1.3.0)

bundler (1.14.6)

bundler-unload (1.0.2)

CFPropertyList (2.2.8)

did_you_mean (1.1.0)

diff-lcs (1.3)

executable-hooks (1.3.2)

facter (2.4.6 ruby universal-darwin)

fast_gettext (1.1.0)

gem-wrappers (1.2.7)

gettext (3.2.2)

gettext-setup (0.24)

hiera (3.3.1)

io-console (default: 0.4.6)

json (2.1.0, default: 2.0.2)

json_pure (1.8.6)

locale (2.1.2)

metaclass (0.0.4)

metadata-json-lint (1.1.0)

minitest (5.10.1)

mocha (1.2.1)

net-telnet (0.1.1)

openssl (default: 2.0.3)

parser (2.4.0.0)

power_assert (0.4.1)

powerpack (0.1.1)

psych (default: 2.2.2)

puppet (4.10.0 ruby universal-darwin)

puppet-lint (2.2.1)

puppet-syntax (2.4.0)

puppetlabs_spec_helper (2.1.2)

rainbow (2.2.2)

rake (12.0.0)

rdoc (default: 5.0.0)

rspec (3.5.0)

rspec-core (3.5.4)

rspec-expectations (3.5.0)

rspec-mocks (3.5.0)

rspec-puppet (2.5.0)

rspec-support (3.5.0)

rubocop (0.48.1)

ruby-progressbar (1.8.1)

rubygems-bundler (1.4.4)

rvm (1.11.3.9)

semantic_puppet (1.0.0)

spdx-licenses (1.1.0)

test-unit (3.2.3)

text (1.3.1)

unicode-display_width (1.2.1)

xmlrpc (0.3.0, 0.2.1)