节点提交不能通过，报如下错误

java.lang.NullPointerException
        at cn.myapps.core.workflow.notification.ejb.Notification.send(Notification.java:142)
        at cn.myapps.core.workflow.notification.ejb.Notification.send(Notification.java:106)
        at cn.myapps.core.workflow.notification.ejb.NotificationProcessBean.notifyCurrentAuditors(NotificationProcessBean.java:153)
        at cn.myapps.core.workflow.storage.runtime.ejb.FlowStateRTProcessBean.doApprove(FlowStateRTProcessBean.java:308)
        at cn.myapps.core.workflow.storage.runtime.ejb.FlowStateRTProcessBean.doApprove(FlowStateRTProcessBean.java:211)
        at cn.myapps.core.dynaform.document.ejb.DocumentProcessBean.doFlow(DocumentProcessBean.java:218)
        at cn.myapps.core.workflow.engine.StateMachineAction.doFlow(StateMachineAction.java:123)
        at sun.reflect.GeneratedMethodAccessor1331.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at com.opensymphony.xwork.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:365)
        at com.opensymphony.xwork.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:217)
        at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:191)
        at com.opensymphony.xwork.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:137)
        at com.opensymphony.xwork.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:81)
        at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
        at com.opensymphony.xwork.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:115)
        at com.opensymphony.xwork.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:81)
        at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
        at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
        at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
        at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
        at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
        at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
        at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
        at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
        at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
        at com.opensymphony.webwork.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:171)

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