Subscription not working

Hi,

I wrote a subscription that triggers the stored procedure whenever any data change in Kepware.

But it doesnt work. 

Please help me in resolving this.

StoredProcedure: execute UpdateStation_RunningStatus @StationName = [[StationName]], @statusName= '' ,
@machVal = [[StageValue]], @timeStamp=[[timeStampStatus]];

Subscription: 

var params = {
StationName: 'Station 01' /* STRING */,
timeStampStatus: eventTime /* DATETIME */,
StatusName: '' /* STRING */,
StageValue: Things["Navistar_Stage1Op_KepTag"].NAVISTAR_STATION1_Stage1Operating_Monitor /* STRING */
};

// result: INTEGER
var result = Things["Navistar_DB_Access"].Execute_DownTime_Stage1Operating(params);

Thanks,

Shalini V.