OCCStatExtension Incorrect 'JavaExtension' Parameter

[cristo]

I want to use java program to retrive stat server's value like 'CurrentNumberChainsFinalized'. but I got error event as below.
'EventError' (1) attributes:
TM_LENGTH [int] = 0
REQ_ID [int] = 2
USER_REQ_ID [int] = -1
STRING_VALUE [str] = "Incorrect 'JavaExtension' Parameter"
TM_SERVER [int] = 1650526761
LONG_VALUE [int] = 4

should I need more parameter in my code ?

                CampaignActionsMask mainMask = ActionsMask.createCMPActionsMask();
CampaignActionsMask relMask = new CampaignActionsMask();
StatisticMetricEx metric = StatisticMetricEx.create();
metric.setCategory(StatisticCategory.JavaCategory);

metric.setMainMask(mainMask);
metric.setRelativeMask(relMask);

metric.setTimeProfile("Default");
metric.setIntervalType(StatisticInterval.GrowingWindow);

thanks for help.