Firewall module error

[LTH]

Trying the firewall module and we're getting a strange error.

/var/lib/puppet/lib/puppet/provider/firewallchain/iptables_chain.rb:34: warning: already initialized constant Mapping
/var/lib/puppet/lib/puppet/provider/firewallchain/iptables_chain.rb:37: warning: already initialized constant InternalChains
/var/lib/puppet/lib/puppet/provider/firewallchain/iptables_chain.rb:38: warning: already initialized constant Tables
/var/lib/puppet/lib/puppet/provider/firewallchain/iptables_chain.rb:39: warning: already initialized constant Nameformat

It seems to disappear after the 2nd run.  Really would like to not get this on the first run too.  Any ideas what we're doing wrong?

We're using puppet 3 although some of the agents are still on 2.7.