[collectd] collectd error

[Jack]

root at ox:/server/collectd# sbin/collectd
Could not find plugin python.
Found a configuration for the `python' plugin, but the plugin isn't loaded or didn't register a configuration callback.
Found a configuration for the `python' plugin, but the plugin isn't loaded or didn't register a configuration callback.
There is a `Module' block within the configuration for the python plugin. The plugin either only expects "simple" configuration statements or wasn't loaded using `LoadPlugin'. Please check your configuration



the configuration file is: 
<LoadPlugin "python">
    Globals true
</LoadPlugin>


<Plugin "python">
    # carbon_writer.py is at path /opt/collectd-plugins/carbon_writer.py
    ModulePath "/server/collectd/collectd-plugins"


    Import "carbon_writer"


    <Module "carbon_writer">
        LineReceiverHost "10.252.35.170"
        LineReceiverPort 2003
        DifferentiateCountersOverTime true
        LowercaseMetricNames true
        TypesDB "/server/collectd/db/types.db"
    </Module>
</Plugin>





my os was Ubuntu 12.04.1 LTS
collectd cant's apt-get install ,so i used  collectd-5.1.1.tar.bz2
what's the problem?
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