[collectd] errors with Filter subsystem: Built-in target `write'

[david van zeebroeck]

hello
i've installed collectd 5.4
everything run fine except i get a lot of error like these from some
clients

[2013-10-15 11:43:45] Filter subsystem: Built-in target `write':
Dispatching value to all write plugins failed with status -1.
[2013-10-15 11:43:45] uc_update: Value too old: name =
elara/disk-dm-0/disk_merged; value time = 1381830225.000; last cache update
= 1381830225.000;
[2013-10-15 11:43:45] Filter subsystem: Built-in target `write':
Dispatching value to all write plugins failed with status -1.
[2013-10-15 11:43:45] uc_update: Value too old: name =
elara/disk-dm-1/disk_octets; value time = 1381830225.000; last cache update
= 1381830225.000;

i've checked that collectd is not running twice
also ntp is running on both server & client and in sync

i'm not using rrdcached

my rrdtool config looks like this :

LoadPlugin rrdtool
<Plugin rrdtool>
       DataDir "/var/lib/collectd/rrd/"
       CreateFilesAsync false
       CacheTimeout 120
       CacheFlush   900
       WritesPerSecond 50
</Plugin>
<target "write">
plugin "rrdtool"
</target>

any clues anyone?
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