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我正在尝试Parcel在同一位置添加不同的对象。我的代码如下所示，其中Rockextends Parcel：

    Point origin = null;
    Rock rock = null;
    for (int i = 0; i < ROCKS; i++) {
        if (i % 10 == 0) {
            origin = model.getRandomUnoccupiedPosition(sim.getRandomGenerator());
            rock = new Rock(origin, destination);
            sim.register(rock);
        } else {
            Rock r = new Rock(origin, destination);
            model.addObjectAtSamePosition(r, rock);
        }
    }

但经过几次迭代后，我在尝试Rock使用 a时收到此错误Vehicle：

Exception in thread "Thread-1" java.lang.IllegalArgumentException: Parcel must be registered and must be either ANNOUNCED or AVAILABE, it is: null. Parcel: [Parcel-103f852].
    at com.google.common.base.Preconditions.checkArgument(Preconditions.java:146)
    at com.github.rinde.rinsim.core.model.pdp.DefaultPDPModel.pickup(DefaultPDPModel.java:175)
    at me.alexrs.mas.roveragent.RoverAgent.tickImpl(RoverAgent.java:105)
    at com.github.rinde.rinsim.core.model.pdp.Vehicle.tick(Vehicle.java:55)
    at com.github.rinde.rinsim.core.model.time.TimeModel.tickImpl(TimeModel.java:139)
    at com.github.rinde.rinsim.core.model.time.SimulatedTimeModel.doStart(SimulatedTimeModel.java:32)
    at com.github.rinde.rinsim.core.model.time.TimeModel.start(TimeModel.java:94)
    at com.github.rinde.rinsim.ui.SimulationViewer$5.run(SimulationViewer.java:399)

唯一Rock注册的是在 中注册的那个Simulator，但是如果我尝试注册多个Rock，我会得到一个异常，说两个对象不能在同一个位置。

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