Hi there

I'd like to make a graph about a Cisco Router's CPU and Memory infos. The shinken is monitoring correctly (I'm using snmpbooster+gendevconfig combo), but the graph didn't created.
I successfully catched the incoming cpu and memory data in the /usr/local/pnp4nagios/var/spool directory, and in the perfdata.log contains:

2013-05-30 11:56:38 [25814] [1] process_perfdata.pl-0.6.17 starting in BULK Mode called by NPCD
2013-05-30 11:56:38 [25814] [1] Found Performance Data for 192.168.200.40 / chassis (processorRam=processorRam: 240123904.00;;0; mem5minFree=mem5minFree: 144443364.00;;0; cpu5min=cpu5min: 14.00;;0; mem5minUsed=mem5minUsed: 31922788.00;;0; cpu1min=cpu1min: 15.00;;0
2013-05-30 11:56:38 [25814] [1] Invalid Perfdata detected
2013-05-30 11:56:38 [25814] [1] 1 lines processed
2013-05-30 11:56:38 [25814] [1] /usr/local/pnp4nagios/var/spool//perfdata.1369907796-PID-25814 deleted
2013-05-30 11:56:38 [25814] [1] PNP exiting (runtime 0.00116s) ...

How can I troubleshoot this "Invalid Perfdata detected" issue ?