'Can't convert nil into String' error upon Puppet run

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http://serverfault.com – When attempting to use modules copied into the Puppet modules directory, my puppet client returns ' Could not retrieve catalog from remote server: Error 400 on SERVER: can't convert nil in String' errors when connecting to the Puppet master server. [root@puppetmaster modules]# rpm -qa *puppet* puppet-2.7.18-1.el6.noarch puppet-server-2.7.18-1.el6.noarch [root@puppetmaster modules]# uname -sr Linux 2.6.32-279.el6.x86_64 Code all checks out and is valid. SELinux is turned on. (HowTos)