Problem with Jasper Subreport

[prinz reyes]

hi im new with jasper report..

i have a master report Agency.jrxml and a subreport Employee.jrxml. When i run my code i get the following exception:

net.sf.jasperreports.engine.JRException: Could not load object from location : Employee.jasper
	at net.sf.jasperreports.engine.util.JRLoader.loadObjectFromLocation(Unknown Source)
	at net.sf.jasperreports.engine.fill.JRFillSubreport.evaluate(Unknown Source)
	at net.sf.jasperreports.engine.fill.JRFillElementContainer.evaluate(Unknown Source)
	at net.sf.jasperreports.engine.fill.JRFillBand.evaluate(Unknown Source)
	at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillColumnBand(Unknown Source)
	at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillDetail(Unknown Source)
	at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillReportStart(Unknown Source)
	at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillReport(Unknown Source)
	at net.sf.jasperreports.engine.fill.JRBaseFiller.fill(Unknown Source)
	at net.sf.jasperreports.engine.fill.JRBaseFiller.fill(Unknown Source)
	at net.sf.jasperreports.engine.fill.JRFiller.fillReport(Unknown Source)
	at net.sf.jasperreports.engine.JasperFillManager.fillReport(Unknown Source)
	at com.las.platf.cl.reports.jasper.JasperUtil.fillReport(JasperUtil.java:28)
	at com.pmbest.view.TestEmployeeReportView.generateReport(TestEmployeeReportView.java:68)
	at com.pmbest.test.reports.AgencyReportTest.main(AgencyReportTest.java:11)

What i did was i passed my subreport dataSource as a parameter in my master report:

Map<String,JRDataSource> params = new HashMap<String, JRDataSource>();
	params.put("subDataSource", subDataSource);
JasperPrint print = JasperUtil.fillReport(REPORT, params, dataSource);

where REPORT --> path of my master Report and dataSource--> JRDataSource of my master report..
im also using ireport..

can someone help me here?tnx