警告:使用RealmObject模型调试时,类型的未关闭文件

这是我第一次尝试将Realm用作本地数据存储,但我遇到了一个我不理解的编译错误。我在其他任何地方都看不到这个错误的任何参考资料。怎么回事?

import android.bluetooth.BluetoothDevice
import io.realm.RealmObject
import io.realm.annotations.PrimaryKey
import io.realm.annotations.RealmClass

@RealmClass
open class DeviceItem(

        @PrimaryKey var id: Long = 0,
        var device: BluetoothDevice? = null,
        var deviceName: String= "",
        var address: String = "",
        connected: String = ""

) : RealmObject() {

    var connected: Boolean = false
        set

    init {
        this.connected = connected === "true"
    }

}

错误:

warning: Unclosed files for the types '[io.realm.ca_test_test_DeviceItemRealmProxy]'; these types will not undergo annotation processing