Puppet users - Jan 2014 - Notify service in one class from other class

I have the following classes:
class zabbix-agent {
...
    package {'zabbix-agent':
        ensure => installed
    }
...
    service { "zabbix-agent":
        ensure     => running,
        start    => "/etc/init.d/zabbix-agent start",
        stop    => "/etc/init.d/zabbix-agent stop",
        status    => "/etc/init.d/zabbix-agent status",
        restart    => "/etc/init.d/zabbix-agent restart",
        require => Package['zabbix-agent']
    }
}

class redis {
...
    file {"/etc/zabbix/zabbix_agentd.conf.d/redis.conf":
        source  => "puppet:///modules/redis/redis_monitoring.conf",
        require => Package['zabbix-agent'],
        notify => Service['zabbix-agent']
    }
...
}

node /^data\d+\.example\.com$/ inherits 'prerun'
{
    class 'redis'
}


node 'prerun' {
... 
   class {'zabbix-agent': stage => pre}
...
}

but that code produces error:

err: Could not apply complete catalog: Found dependency cycles in the 
following relationships: Service[zabbix-agent] => 
File[/etc/redis/redis.conf], Package[redis-server] => 
File[/etc/redis/redis.conf], Service[zabbix-agent] => Class[Settings], 
Service[zabbix-agent] => File[/etc/puppet/puppet.conf], 
File[/etc/zabbix/zabbix_agentd.conf.d/redis_monitoring.conf] => 
Service[zabbix-agent], Service[zabbix-agent] => 
File[/etc/zabbix/zabbix_agentd.conf.d/redis_monitoring.conf], 
Service[zabbix-agent] => File[/etc/puppet/auth.conf], Service[zabbix-agent] 
=> Class[prerun], File[/etc/redis/redis.conf] => Service[redis-server], 
Service[zabbix-agent] => Service[redis-server], Service[zabbix-agent] => 
Package[redis-server], Service[zabbix-agent] => 
File[/etc/puppet/namespaceauth.conf], Service[zabbix-agent] => 
Class[datad.leaderboard.lvis.tv]; try using the '--graph' option and
open
the '.dot' files in OmniGraffle or GraphViz

what's wrong? if I comment out 'notify' puppet doesn't complain,
but
doesn't restart service too.

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