Fixed the path of the touch command.

manifests/init.pp

@@ -33,7 +33,7 @@ class aes {
 
   # File to easily see when Puppet was last executed.
   # Ideally, we would like to know if it is devel or production as well.
-  exec { 'touch /var/last_puppet_run' : 
+  exec { '/usr/bin/touch /var/last_puppet_run' : 
     cwd => "/var",
     creates => "/var/last_puppet_run",
     user => root,