Puppet users - Sep 2014 - Question about Puppet Master Configuration

I have a particular question about an error message I keep receiving. I 
have installed Puppet on Centos 6.5. I have two servers running. One as the 
Puppet Master and the other as the Puppet client. 

Every time I run this command: puppet master --verbose --no-daemonize

as the root user 

I get this error: 

Notice: Starting Puppet master version 3.7.1
Error: Could not run: Could not create PID file: /var/run/puppet/master.pid

What would be the reason why now I am getting that error? Is puppet master 
supposed to be running? How can I create the CA certificate and the puppet 
master certificate if that command can't be fixed?

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