MultipleInstanceExample.java file is not working in here

When the source code runs it it gives error message as below...

13:05:58.898 [main] ERROR o.d.core.xml.ExtensibleXmlParser - (null: 2, 583): cvc-elt.1: Cannot find the declaration of element 'definitions'.
java.lang.IllegalArgumentException: Could not find target node for connection:_2
at org.jbpm.bpmn2.xml.ProcessHandler.findNodeByIdOrUniqueIdInMetadata(ProcessHandler.java:288)
at org.jbpm.bpmn2.xml.ProcessHandler.linkConnections(ProcessHandler.java:317)
at org.jbpm.bpmn2.xml.ProcessHandler.end(ProcessHandler.java:184)
at org.drools.core.xml.ExtensibleXmlParser.endElement(ExtensibleXmlParser.java:439)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endElement(AbstractSAXParser.java:609)
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.endElement(XMLSchemaValidator.java:863)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEndElement(XMLDocumentFragmentScannerImpl.java:1782)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2973)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:606)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:117)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:510)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:848)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:777)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1213)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:649)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl.parse(SAXParserImpl.java:333)
at org.drools.core.xml.ExtensibleXmlParser.read(ExtensibleXmlParser.java:318)
at org.drools.core.xml.ExtensibleXmlParser.read(ExtensibleXmlParser.java:180)
at org.jbpm.compiler.xml.XmlProcessReader.read(XmlProcessReader.java:61)
at org.jbpm.compiler.ProcessBuilderImpl.addProcessFromXml(ProcessBuilderImpl.java:284)
at org.drools.compiler.builder.impl.KnowledgeBuilderImpl.addProcessFromXml(KnowledgeBuilderImpl.java:711)
at org.drools.compiler.builder.impl.KnowledgeBuilderImpl.addKnowledgeResource(KnowledgeBuilderImpl.java:764)
at org.drools.compiler.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:2239)
at org.drools.compiler.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:2228)
at org.jbpm.runtime.manager.impl.SimpleRuntimeEnvironment.addAsset(SimpleRuntimeEnvironment.java:162)
at org.jbpm.runtime.manager.impl.RuntimeEnvironmentBuilder.addAsset(RuntimeEnvironmentBuilder.java:341)
at org.jbpm.runtime.manager.impl.RuntimeEnvironmentBuilder.addAsset(RuntimeEnvironmentBuilder.java:74)
at org.jbpm.examples.multipleinstance.MultipleInstanceExample.getRuntimeManager(MultipleInstanceExample.java:72)
at org.jbpm.examples.multipleinstance.MultipleInstanceExample.main(MultipleInstanceExample.java:39)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)
java.lang.IllegalArgumentException: Cannot add asset: unable to parse xml : Exception class java.lang.IllegalArgumentException : Could not find target node for connection:_2,
at org.jbpm.runtime.manager.impl.SimpleRuntimeEnvironment.addAsset(SimpleRuntimeEnvironment.java:171)
at org.jbpm.runtime.manager.impl.RuntimeEnvironmentBuilder.addAsset(RuntimeEnvironmentBuilder.java:341)
at org.jbpm.runtime.manager.impl.RuntimeEnvironmentBuilder.addAsset(RuntimeEnvironmentBuilder.java:74)
at org.jbpm.examples.multipleinstance.MultipleInstanceExample.getRuntimeManager(MultipleInstanceExample.java:72)
at org.jbpm.examples.multipleinstance.MultipleInstanceExample.main(MultipleInstanceExample.java:39)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)