Omnet++ “如何修复”；信标evt当前已安排；在静脉中控制自我时出错

我想实现一个循环计时器来实现这一点，我使用self-msg做了以下工作：

void rsuApp::initialize(int stage) {
    BaseWaveApplLayer::initialize(stage);
   if (stage == 0) {
        event = new cMessage("event");
        EV << "Scheduling first send to t=5.0s\n";
        scheduleAt(10, event);
    }
}

我不明白为什么会出现这个错误，因为我没有安排任何信标事件，我在handleSelfMsg（）函数中重新安排了self消息，这意味着在收到它之后，所以我不明白为什么会出现这个错误

void rsuApp::handleSelfMsg(cMessage* msg) {
    BaseWaveApplLayer::handleSelfMsg(msg);
    if(msg==event){
        EV<<"self message receives";
        scheduleAt(simTime()+10, event);
    }
}

scheduleAt(): Message (omnetpp::cMessage)beacon evt is currently scheduled,
 use cancelEvent() before rescheduling -- in module (rsuApp)
 trackingNetwork.rsu[0].appl (id=8), at t=20s, event #453