普元 BPS 7.5 启动人工活动偶尔报错：The activity excuter list is null ,activity instance ID: 71

【问题】

启动人工活动偶尔报错：

Message: Start manual activity error
        at com.primeton.workflow.engine.scheduler.event.handler.activity.visitors.ManualActivityVisitor.startActivity(ManualActivityVisitor.java:97)
        at com.primeton.workflow.engine.scheduler.event.handler.activity.ActivityExecuter.invoke(ActivityExecuter.java:234)
        at com.primeton.workflow.event.framework.event.base.WFEventExecutor.handleEvent(WFEventExecutor.java:175)
        at com.primeton.workflow.event.framework.event.base.EventServiceRunnerImpl.processOneContext(EventServiceRunnerImpl.java:215)
        at com.primeton.workflow.event.framework.event.base.EventServiceRunnerImpl.processOneContextSafe(EventServiceRunnerImpl.java:188)
        ......
Caused by: ErrCode: 21040516
Message: The activity excuter list is null ,activity instance ID: 71
        at com.primeton.workflow.engine.scheduler.event.handler.activity.ActivityWorkItemDispatcher.dispatch(ActivityWorkItemDispatcher.java:309)
        at com.primeton.workflow.engine.scheduler.event.handler.activity.ActivityExecuterAction.execute(ActivityExecuterAction.java:280)
        at com.primeton.workflow.engine.scheduler.enginelog.EngineLogExecutor.executeAction(EngineLogExecutor.java:162)
        at com.primeton.workflow.engine.scheduler.event.handler.activity.visitors.ManualActivityVisitor.startActivity(ManualActivityVisitor.java:93)
        ... 85 more

【解答】

问题原因：启动失败的人工活动参与者设置有误，存在取不到参与者的情况，所以有时启动报错