Puppet users - Feb 2013 - irregular Error: "Could not autoload..."

Hallo,
I am trying to establish an puppet infrastructure, but my server is 
throwing errors irregulary. Sometimes it workes, sometimes not. 

The master: puppet master --no-daemonize --verbose --debug --server XXXXX 
--certname XXXXX
The agent: puppet agent --test --debug --server XXXXX


... and the error thrown by the agent:
> Error: Could not retrieve catalog from remote server: Error 400 on SERVER: 
> Could not autoload puppet/type/service: Permission denied - getcwd on node 
> XXXXX
> Warning: Not using cache on failed catalog
> Error: Could not retrieve catalog; skipping run
 
... and by the server:
> Error: Could not autoload puppet/type/service: Permission denied - getcwd
> Error: Could not autoload puppet/type/service: Permission denied - getcwd 
> on node XXXXX
> Error: Could not autoload puppet/type/service: Permission denied - getcwd 
> on node XXXXX
> Error: Could not autoload puppet/type/service: Permission denied - getcwd 
> on node XXXXX


The problem varies by "puppet/type/service",
puppet/type/package",
"puppet/type/augeas".... And sometimes it just works.
What''s the reason for that?

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