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I am running the ant start.human.task script and getting the attached error. Please suggest how to fix this.

[javac]                              ^

    [javac] C:\jBPM\jbpm-installer\task-service\src\org\jbpm\DemoTaskService.jav

a:33: package org.jbpm.task.service does not exist

    [javac] import org.jbpm.task.service.TaskServiceSession;

    [javac]                              ^

    [javac] C:\jBPM\jbpm-installer\task-service\src\org\jbpm\DemoTaskService.jav

a:34: package org.jbpm.task.service.mina does not exist

    [javac] import org.jbpm.task.service.mina.MinaTaskServer;

    [javac]                                   ^

    [javac] C:\jBPM\jbpm-installer\task-service\src\org\jbpm\DemoTaskService.jav

a:35: package org.drools does not exist

    [javac] import org.drools.SystemEventListenerFactory;

    [javac]                   ^

    [javac] C:\jBPM\jbpm-installer\task-service\src\org\jbpm\DemoTaskService.jav

a:36: package org.mvel2 does not exist

    [javac] import org.mvel2.MVEL;

    [javac]                  ^

    [javac] C:\jBPM\jbpm-installer\task-service\src\org\jbpm\DemoTaskService.jav

a:37: package org.mvel2 does not exist

    [javac] import org.mvel2.ParserContext;

    [javac]                  ^

    [javac] C:\jBPM\jbpm-installer\task-service\src\org\jbpm\DemoTaskService.jav

a:38: package org.mvel2.compiler does not exist

    [javac] import org.mvel2.compiler.ExpressionCompiler;

    [javac]                           ^

    [javac] C:\jBPM\jbpm-installer\task-service\src\org\jbpm\DemoTaskService.jav

a:43: cannot find symbol

    [javac] symbol  : class EntityManagerFactory

    [javac] location: class org.jbpm.DemoTaskService

    [javac]         EntityManagerFactory emf = Persistence.createEntityManagerFa

ctory("org.jbpm.task");

    [javac]         ^

    [javac] C:\jBPM\jbpm-installer\task-service\src\org\jbpm\DemoTaskService.jav

a:43: cannot find symbol

    [javac] symbol  : variable Persistence

    [javac] location: class org.jbpm.DemoTaskService

    [javac]         EntityManagerFactory emf = Persistence.createEntityManagerFa

ctory("org.jbpm.task");

    [javac]                                    ^

    [javac] C:\jBPM\jbpm-installer\task-service\src\org\jbpm\DemoTaskService.jav

a:44: cannot find symbol

    [javac] symbol  : class TaskService

    [javac] location: class org.jbpm.DemoTaskService

    [javac]         TaskService taskService = new TaskService(emf, SystemEventLi

stenerFactory.getSystemEventListener());

    [javac]         ^

    [javac] C:\jBPM\jbpm-installer\task-service\src\org\jbpm\DemoTaskService.jav

a:44: cannot find symbol

    [javac] symbol  : class TaskService

    [javac] location: class org.jbpm.DemoTaskService

    [javac]         TaskService taskService = new TaskService(emf, SystemEventLi

stenerFactory.getSystemEventListener());

    [javac]                                       ^

    [javac] C:\jBPM\jbpm-installer\task-service\src\org\jbpm\DemoTaskService.jav

a:44: cannot find symbol

    [javac] symbol  : variable SystemEventListenerFactory

    [javac] location: class org.jbpm.DemoTaskService

    [javac]         TaskService taskService = new TaskService(emf, SystemEventLi

stenerFactory.getSystemEventListener());

    [javac]                                                        ^

    [javac] C:\jBPM\jbpm-installer\task-service\src\org\jbpm\DemoTaskService.jav

a:45: cannot find symbol

    [javac] symbol  : class TaskServiceSession

    [javac] location: class org.jbpm.DemoTaskService

    [javac]         TaskServiceSession taskSession = taskService.createSession()

;

    [javac]         ^

    [javac] C:\jBPM\jbpm-installer\task-service\src\org\jbpm\DemoTaskService.jav

a:49: cannot find symbol

    [javac] symbol  : class User

    [javac] location: class org.jbpm.DemoTaskService

    [javac]         Map<String, User> users = ( Map<String, User> ) eval( reader

, vars );