Hi I want to execute this code but when I try it I have this error.
here is my poarent process xml code:

<?xml version="1.0" encoding="UTF-8"?>

<process-definition
xmlns="urn:jbpm.org:jpdl-3.2" name="ana">
<state name="state">
<transition name="" to="subprocess"></transition>
</state>
<process-state name="subprocess">
<sub-process name="cocuk" version="1"/>
<transition name="" to="end"></transition>
</process-state>
<end-state name="end"></end-state>
</process-definition>

here is my child xml code:

<?xml version="1.0" encoding="UTF-8"?>
<process-definition
xmlns="urn:jbpm.org:jpdl-3.2" name="cocuk">
<start-state name="start">
<transition name="" to="state">
</transition>
</start-state>
<state name="state">
<transition name="" to="end">
</transition>
</state>
<end-state name="end"></end-state>
</process-definition>

ana my tescase code:

public class Subproces extends TestCase {

public void testBasicScenario() {
ProcessDefinition superProcessDefinition = ProcessDefinition.parseXmlResource("ana/processdefinition.xml");
ProcessDefinition subProcessDefinition = ProcessDefinition.parseXmlResource("cocuk/processdefinition.xml");
ProcessState processState = (ProcessState) superProcessDefinition.getNode("subprocess");
processState.setSubProcessDefinition(subProcessDefinition);

ProcessInstance superProcessInstance = new ProcessInstance(superProcessDefinition);
superProcessInstance.signal();
Token superToken = superProcessInstance.getRootToken();
assertSame(processState, superToken.getNode());
ProcessInstance subProcessInstance = superToken.getSubProcessInstance();
assertSame(subProcessDefinition, subProcessInstance.getProcessDefinition()); Token subToken = subProcessInstance.getRootToken();

assertSame(subProcessDefinition.getNode("state"), subToken.getNode());

subToken.signal();

assertSame(subProcessDefinition.getNode("end"), subToken.getNode());
assertTrue(subToken.hasEnded());
assertTrue(subProcessInstance.hasEnded());

assertSame(superProcessDefinition.getNode("end"), superToken.getNode());
assertTrue(superToken.hasEnded());
assertTrue(superProcessInstance.hasEnded());


}

}

when I run it this error has been occured:

org.jbpm.JbpmException: token 'Token(/)' can't be signalled cause it is currently not positioned in a node
at org.jbpm.graph.exe.Token.signal(Token.java:134)
at org.jbpm.graph.exe.ProcessInstance.signal(ProcessInstance.java:270)
at com.sub.sub.testBasicScenario(sub.java:24)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at junit.framework.TestCase.runTest(TestCase.java:154)
at junit.framework.TestCase.runBare(TestCase.java:127)
at junit.framework.TestResult$1.protect(TestResult.java:106)
at junit.framework.TestResult.runProtected(TestResult.java:124)
at junit.framework.TestResult.run(TestResult.java:109)
at junit.framework.TestCase.run(TestCase.java:118)
at junit.framework.TestSuite.runTest(TestSuite.java:208)
at junit.framework.TestSuite.run(TestSuite.java:203)
at org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:128)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)