cannot load such file -- puppetserver/ca/cli (LoadError)

[shoebill]

Full Error:

$ puppetserver ca setup                            
Traceback (most recent call last):
	2: from /opt/puppetlabs/server/apps/puppetserver/cli/apps/ca:3:in `<main>'
	1: from /opt/puppetlabs/puppet/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require'
/opt/puppetlabs/puppet/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in `require': cannot load such file -- puppetserver/ca/cli (LoadError)

Trying to create a cert after installation.

If you see this error run the command with root privileges.

$ sudo /opt/puppetlabs/server/bin/puppetserver ca setup