J'ai maintenant un problème pour récupérer mon .rptdesign

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		/* Préparation de l'édition */
		try {
			design = engine.openReportDesign("C:/download/birt/birt-runtime-2_1_1/ReportEngine/samples/hello_world.rptdesign");
		} catch (EngineException e) {
			e.printStackTrace();
		}
Me renvoi l'erreur suivante:

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 org.apache.crimson.parser.Parser2.maybeElement(Unknown Source)
at org.apache.crimson.parser.Parser2.content(Unknown Source)
at org.apache.crimson.parser.Parser2.maybeElement(Unknown Source)
at org.apache.crimson.parser.Parser2.content(Unknown Source)
at org.apache.crimson.parser.Parser2.maybeElement(Unknown Source)
at org.apache.crimson.parser.Parser2.content(Unknown Source)
at org.apache.crimson.parser.Parser2.maybeElement(Unknown Source)
at org.apache.crimson.parser.Parser2.content(Unknown Source)
at org.apache.crimson.parser.Parser2.maybeElement(Unknown Source)
at org.apache.crimson.parser.Parser2.parseInternal(Unknown Source)
at org.apache.crimson.parser.Parser2.parse(Unknown Source)
at org.apache.crimson.parser.XMLReaderImpl.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 Execution.Execution.main(Execution.java:28)
j'ai bien récupéré et décompressé le BIRT runtime.
J'ai spécifié son adresse:
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engineConfig.setEngineHome("C:/download/birt/birt-runtime-2_1_1/ReportEngine");
Je ne comprends plus