[BIRT]problème à la génération du rapport

Exception in thread "main" java.lang.NoClassDefFoundError: com/ibm/icu/util/ULocale
	at org.eclipse.birt.core.format.NumberFormatter.<init>(NumberFormatter.java:51)
	at org.eclipse.birt.report.model.api.util.StringUtil.doubleToString(StringUtil.java:208)
	at org.eclipse.birt.report.model.api.metadata.DimensionValue.toString(DimensionValue.java:375)
	at org.eclipse.birt.report.model.metadata.DimensionPropertyType.validateXml(DimensionPropertyType.java:240)
	at org.eclipse.birt.report.model.metadata.PropertyDefn.validateXml(PropertyDefn.java:759)
	at org.eclipse.birt.report.model.metadata.MetaDataHandler$DefaultValueState.end(MetaDataHandler.java:1226)
	at org.eclipse.birt.report.model.util.XMLParserHandler.endElement(XMLParserHandler.java:174)
	at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endElement(Unknown Source)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEndElement(Unknown Source)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(Unknown Source)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
	at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
	at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)
	at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
	at javax.xml.parsers.SAXParser.parse(Unknown Source)
	at javax.xml.parsers.SAXParser.parse(Unknown Source)
	at org.eclipse.birt.report.model.metadata.MetaDataReader.read(MetaDataReader.java:116)
	at org.eclipse.birt.report.model.api.impl.DesignEngineImpl.initialize(DesignEngineImpl.java:93)
	at org.eclipse.birt.report.model.api.impl.DesignEngineImpl.newSessionHandle(DesignEngineImpl.java:137)
	at org.eclipse.birt.report.model.api.DesignEngine.newSessionHandle(DesignEngine.java:106)
	at org.eclipse.birt.report.model.api.DesignEngine.newSession(DesignEngine.java:128)
	at org.eclipse.birt.report.engine.parser.ReportParser.getDesignHandle(ReportParser.java:145)
	at org.eclipse.birt.report.engine.api.impl.ReportEngineHelper.openReportDesign(ReportEngineHelper.java:243)
	at org.eclipse.birt.report.engine.api.impl.ReportEngineHelper.openReportDesign(ReportEngineHelper.java:191)
	at org.eclipse.birt.report.engine.api.impl.ReportEngineHelper.openReportDesign(ReportEngineHelper.java:125)
	at org.eclipse.birt.report.engine.api.impl.ReportEngine.openReportDesign(ReportEngine.java:224)
	at org.eclipse.birt.report.engine.api.ReportEngine.openReportDesign(ReportEngine.java:111)
	at com.BIRT.rapport.Rapport.generer(Rapport.java:35)
	at com.BIRT.rapport.Rapport.main(Rapport.java:69)