Puppet users - Dec 2013 - mco package fail with puppet 3.4.0

When I upgrade a node with puppet 3.4.0, puppet-package is broken :

~$  mco package puppet status -I $(facter hostname) -v

 | [ >                                                             ] 0 / 1
The package application failed to run, use -v for full error details: undefined
class/module Puppet::

undefined class/module Puppet:: (ArgumentError)
	from /usr/libexec/mcollective/mcollective/security/psk.rb:27:in `load' 
<----
	from /usr/libexec/mcollective/mcollective/security/psk.rb:27:in `decodemsg'
	from /usr/lib/ruby/site_ruby/1.8/mcollective/message.rb:182:in `decode!'
	from /usr/lib/ruby/site_ruby/1.8/mcollective/client.rb:93:in `receive'
	from /usr/lib/ruby/site_ruby/1.8/mcollective/client.rb:152:in `req'
	from /usr/lib/ruby/site_ruby/1.8/mcollective/client.rb:151:in `loop'
	from /usr/lib/ruby/site_ruby/1.8/mcollective/client.rb:151:in `req'
	from /usr/lib/ruby/1.8/timeout.rb:67:in `timeout'
	from /usr/lib/ruby/site_ruby/1.8/mcollective/client.rb:148:in `req'
	from /usr/lib/ruby/site_ruby/1.8/mcollective/rpc/client.rb:851:in
`call_agent'
	from /usr/lib/ruby/site_ruby/1.8/mcollective/rpc/client.rb:244:in
`method_missing'
	from /usr/libexec/mcollective/mcollective/application/package.rb:63:in
`send'
	from /usr/libexec/mcollective/mcollective/application/package.rb:63:in
`main'
	from /usr/lib/ruby/site_ruby/1.8/mcollective/application.rb:285:in `run'
	from /usr/lib/ruby/site_ruby/1.8/mcollective/applications.rb:23:in `run'
	from /usr/bin/mco:20

I'm running this on a up to date scientific linux 6.4 with up to date
mcollective and puppet rpm directly from puppet labs :

~# rpm -qa | grep -e puppet -e mcollective
mcollective-package-agent-4.2.0-1.noarch
mcollective-package-client-4.2.0-1.noarch
mcollective-2.2.4-1.el6.noarch
puppet-3.4.0-1.el6.noarch
puppetlabs-release-6-7.noarch
mcollective-common-2.2.4-1.el6.noarch
mcollective-client-2.2.4-1.el6.noarch
mcollective-puppet-common-1.6.0-1.noarch
mcollective-puppet-client-1.6.0-1.noarch
mcollective-package-common-4.2.0-1.noarch

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