Error when running puppet agent -t, Could not retrieve catalog from remote server: Error 400 on SERVER

Issue

• When running the command puppet agent -t the following error is observed on the console

Error 400 on SERVER: "class { '::ntp':\r\n  servers => [ 'xx.xx.xx.xx' ],\r\n}" is not an Array.  It looks to be a String at /etc/puppet/environments/KT_Integris_Prod_Infrastructure_6/modules/ntp/manifests/init.pp:44 on node yourHostname
Warning: Not using cache on failed catalog
Error: Could not retrieve catalog; skipping run

• Did upgrade of our satellite 6.0 installation to version 6.1 on RHEL 7.
• Now facing issue with puppet smart class parameter, while adding a puppet module to a host. The smart class parameter uses yaml as parameter type. Getting an error when creating a yaml dump from the GUI.

Unable to generate output, Check log files\n

the output of the command puppet agent -t on the client is

Warning: Unable to fetch my node definition, but the agent run will continue:
Warning: Error 400 on SERVER: Failed to find `xyz.com` via exec: Execution of '/etc/puppet/node.rb xyzl' returned 1:

Error: Could not retrieve catalog from remote server: Error 400 on SERVER: Failed when searching for node `xyz`: Failed to find  `xyz`  via exec: Execution of '/etc/puppet/node.rb xyz' returned 1:
Warning: Not using cache on failed catalog
Error: Could not retrieve catalog; skipping run

This only happens when yaml is used as parameter type, before the upgrade to 6.1 had no problems.

• In /var/log/foreman/production.log can see :

2015-08-28 08:29:11 [W] Failed to generate external nodes for `xyz`  with undefined local variable or method `logger' for #<Classification::ClassParam:0x000000105daf60>