Setting up a three tier environment in puppet

Question

These are my files:

1. Nodes.pp file
2. site.pp file

I need to setup the infrastructure in the diagram, and I would like to use Puppet Automation in order to do so. I would need to, 

1. Create 4 VMs, one for DB, 1 web server, 1 load balancer, 1 master
2. Set them up with Puppet Agent
3. Find the appropriate modules/cookbooks from the community site (Puppet Forge/ Chef Supermarket)
4. Configure the nodes using recipes/classes fetched from the community sites.

5. Provide configuration parameters in order to have all these nodes connect to each other.

     End goal is to have a working Wordpress setup.

I got stuck with the master agent configuration process. I have a Puppet master and 3 agents up and running. But, but whenever I run #puppet agent --test in the agent, It throws an error. I look forward to the community's help.

The error I am getting is...

[root@agent1 vagrant]# puppet agent --noop --test
Info: Retrieving pluginfacts
Info: Retrieving plugin
Info: Loading facts
Error: Could not retrieve catalog from remote server: Error 400 on SERVER: Could
Warning: Not using cache on failed catalog
Error: Could not retrieve catalog; skipping run

Answer 1

First take a look at the puppet master logs. Second: The error message is to short. There is missing something after the Error: Could not retrieve catalog from remote server: Error 400 on SERVER: Could The text after the "Could" can be helpful ;)