ASN。1如何使用选项类型

我的模式设计如下。

Motorcar ::= SEQUENCE {
    carRegNumber VisibleString
}

Bicycle ::= SEQUENCE {
   bicycleColor VisibleString,
   bicycleModel VisibleString
}

Boat ::= SEQUENCE {
    boatRegNumber VisibleString
}

PreferredVehicle ::= CHOICE { car Motorcar, bicycle Bicycle, boat Boat }

Person ::= SEQUENCE {
    name VisibleString,
    id VisibleString,
    preferredVehicle PreferredVehicle
}

当我在' http://asn1-playground.oss.com/ ,编译成功。

但是,当我创建Person类型的对象时,我会出错。

myBicycle Bicycle ::= {
    bicycleColor "Blue",
    bicycleModel "Hero 42M"
}

person Person ::= {
    name "Rama Krishna",
    id "I123456",
    preferredVehicle myBicycle
}

谁能告诉我我的模式和数据有什么问题吗。