I just found the answer in another thread.

In case somebody is looking to pass parameters from the dashboard to your 
classes you should
reference those variables like this:

$::foo instead of $foo which are local variables

Hope it helps

On Friday, October 26, 2012 10:28:11 AM UTC-6, Javier Alvarez Samayoa wrote:
>
> Good day to all:
>
> I'm trying to use the browser's dashboard to pass a parameter variable to 
> a simple class.
>
> class hello ( $file_name ) {
>   file {"/tmp/${file_name}":
>     owner => 'ubuntu',
>     group => 'ubuntu'
>   }
> }
>
> But when I run the agent update I keep getting
>
> ubuntu@db:~$ sudo puppet agent --test
> info: Retrieving plugin
> info: Loading facts in /var/opt/lib/pe-puppet/lib/facter/facter_dot_d.rb
> info: Loading facts in /var/opt/lib/pe-puppet/lib/facter/puppet_vardir.rb
> info: Loading facts in /var/opt/lib/pe-puppet/lib/facter/root_home.rb
> err: Could not retrieve catalog from remote server: Error 400 on SERVER: 
> Must pass file_name to Class[Hello] at 
> /etc/puppetlabs/puppet/modules/hello/manifests/init.pp:1 on node 
> db.company.com
>
> Any ideas on what I'm doing wrong?
>
> Thanks in advance.
>

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