Puppet users - Mar 2014 - Puppet 2.6.18 Automodule loading -> Wrong number of Arguments (1 for 2)

Dear Puppet-Users,

I'm currently stucking at a wired error message.
Below I've posted all important output.
When I run this configuration on the same machine or on an client I geht 
the following error:
err: Could not retrieve catalog from remote server: Error 400 on SERVER: 
wrong number of arguments (1 for 2) at /etc/puppet/manifests/site.pp:2


[code]
puppet@de-dussmon2:/etc/puppet/manifests> puppet --version
2.6.18
[/code]

[code]
puppet@de-dussmon2:/etc/puppet/manifests> cat site.pp
node default {
  include test
}
[/code]

[code]
puppet@de-dussmon2:/etc/puppet/manifests/modules/test/manifests> cat init.pp
class test{
    case $::operatingsystem {
        'SLES': {
            $path_file = "/etc/puppet/testfile"
        }
        'windows': {
            $path_file = "C:/testfile.txt"
        }
    }

    file {'testfile':
        path    => $path_file,
        ensure  => file,
        content => $operatingsystem,
    }
}
[/code]

[code]
puppet@de-dussmon2:/etc/puppet/manifests/modules/test/manifests> puppet 
master --configprint modulpath
/etc/puppet/manifests/modules
[/code]

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