Getting error "Warning: Error 400 on SERVER: Failed to find xxx via exec: Execution of '/etc/puppet/node.rb xxx ' returned 1" when running puppet agent command

Issue

• Receiving the following error with puppet-agent commands:

  [root@puppetclient]# puppet agent -t
  Warning: Unable to fetch my node definition, but the agent run will continue:
  Warning: Error 400 on SERVER: Failed to find puppetclient.example.com via exec: Execution of '/etc/puppet/node.rb puppetclient.example.com' returned 1:
  Info: Retrieving plugin
  Info: Loading facts in /var/lib/puppet/lib/facter/facter_dot_d.rb
  Info: Loading facts in /var/lib/puppet/lib/facter/root_home.rb
  Info: Loading facts in /var/lib/puppet/lib/facter/puppet_vardir.rb
  Info: Loading facts in /var/lib/puppet/lib/facter/pe_version.rb
  Error: Could not retrieve catalog from remote server: Error 400 on SERVER: Failed when searching for node puppetclient.example.com: Failed to find puppetclient.example.com via exec: Execution of '/etc/puppet/node.rb puppetclient.example.com' returned 1:
  Warning: Not using cache on failed catalog
  Error: Could not retrieve catalog; skipping run