jbpm4.4 el 报错,几个el.jar怎么删或移都不行啊：报错

怎么删或者移动 juel-api.jar juel-engine.jar juel-impl.jar 都无效,都说删除tomcat的el,然后将这三个放入tomcatlib,然后工程删除这三个,但不行. 各种删法,移动方法都不行,我靠.

javax.el.PropertyNotFoundException: Cannot resolve identifier 'proposer' de.odysseus.el.tree.impl.ast.AstIdentifier.eval(AstIdentifier.java:86) de.odysseus.el.tree.impl.ast.AstEval.eval(AstEval.java:51) de.odysseus.el.tree.impl.ast.AstNode.getValue(AstNode.java:28) de.odysseus.el.TreeValueExpression.getValue(TreeValueExpression.java:122) org.jbpm.pvm.internal.el.UelValueExpression.evaluateInScope(UelValueExpression.java:52) org.jbpm.pvm.internal.el.Expression.evaluate(Expression.java:112) org.jbpm.pvm.internal.model.ExecutionImpl.initializeAssignments(ExecutionImpl.java:778) org.jbpm.jpdl.internal.activity.TaskActivity.execute(TaskActivity.java:107) org.jbpm.jpdl.internal.activity.TaskActivity.execute(TaskActivity.java:58) org.jbpm.pvm.internal.model.op.ExecuteActivity.perform(ExecuteActivity.java:60) org.jbpm.pvm.internal.model.ExecutionImpl.performAtomicOperationSync(ExecutionImpl.java:672) org.jbpm.pvm.internal.model.ExecutionImpl.performAtomicOperation(ExecutionImpl.java:632) org.jbpm.pvm.internal.model.ExecutionImpl.start(ExecutionImpl.java:217) org.jbpm.pvm.internal.cmd.StartProcessInstanceInLatestCmd.execute(StartProcessInstanceInLatestCmd.java:63) org.jbpm.pvm.internal.cmd.StartProcessInstanceInLatestCmd.execute(StartProcessInstanceInLatestCmd.java:36) org.jbpm.pvm.internal.svc.DefaultCommandService.execute(DefaultCommandService.java:42) org.jbpm.pvm.internal.tx.StandardTransactionInterceptor.execute(StandardTransactionInterceptor.java:50) org.jbpm.pvm.internal.svc.EnvironmentInterceptor.executeInNewEnvironment(EnvironmentInterceptor.java:53) org.jbpm.pvm.internal.svc.EnvironmentInterceptor.execute(EnvironmentInterceptor.java:40) org.jbpm.pvm.internal.svc.RetryInterceptor.execute(RetryInterceptor.java:56) org.jbpm.pvm.internal.svc.SkipInterceptor.execute(SkipInterceptor.java:43) org.jbpm.pvm.internal.svc.ExecutionServiceImpl.startProcessInstanceByKey(ExecutionServiceImpl.java:67) org.apache.jsp.index_jsp._jspService(index_jsp.java:60) org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) javax.servlet.http.HttpServlet.service(HttpServlet.java:717) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:386) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260) javax.servlet.http.HttpServlet.service(HttpServlet.java:717)