Why does Puppet say “Error: source did not contain any PSON!”?

If a puppet agent run is interrupted, it can leave an “agent_disabled.lock” file behind. Make certain that Puppet really isn’t running, then delete it: # ls -l /var/lib/puppet/state/ total 236K -rw-r–r– 1 root root    0 Feb 11 10:36 agent_disabled.lock drwxr-xr-x 2 root root 4.0K Jan 21 17:06 graphs/ -rw-r—– 1 root root 149K Feb 11 …

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