Puppet users - May 2014 - Error 400 on SERVER: no 'environments' in {:root_environment=>#<Puppet::Node::Environment:0x7f784c700668 @name=:"*root*", @manifest="/usr/share/puppet/rack/puppetmasterd", @modulepath=[]>

Hi to Everybody,
I'm working with puppet since some months.
I'm managing a medium environment with some hundreds of nodes.

I installed passenger and everything worked fine following this 
documentation:
http://docs.puppetlabs.com/guides/passenger.html#example-vhost-configuration

Today I tried to install also Dashboard.
The installation seems to complete correctly then I restarted httpd server 
and still ok.
But when I go on one client and run the command 


puppet agent --test --environment vargas

I got this error

err: Could not retrieve catalog from remote server: Error 400 on SERVER: no 
'environments' in 
{:root_environment=>#<Puppet::Node::Environment:0x7f784c700668 
@name=:"*root*",
@manifest="/usr/share/puppet/rack/puppetmasterd",
@modulepath=[]>, 
:current_environment=>#<Puppet::Node::Environment:0x7f784c700668 
@name=:"*root*",
@manifest="/usr/share/puppet/rack/puppetmasterd",
@modulepath=[]>} at top of []
warning: Not using cache on failed catalog
err: Could not retrieve catalog; skipping run
err: Could not send report: Error 400 on SERVER: no 'environments' in 
{:root_environment=>#<Puppet::Node::Environment:0x7f784c700668 
@name=:"*root*",
@manifest="/usr/share/puppet/rack/puppetmasterd",
@modulepath=[]>, 
:current_environment=>#<Puppet::Node::Environment:0x7f784c700668 
@name=:"*root*",
@manifest="/usr/share/puppet/rack/puppetmasterd",
@modulepath=[]>} at top of []

same thing if I don't chose the environment.
Instead if I switch off httpd and restart normal puppetmaster everything 
works fine.

Has anyone already seen this type of error?
Thank you
Cheers.

   Luca

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