Android Exception:java.lang.IllegalArgumentException

[ziyu]

android.os.Parcel.readException(Parcel.java:2017)
android.os.Parcel.readException(Parcel.java:1959)
android.app.INotificationManager$Stub$Proxy.createNotificationChannels(INotificationManager.java:1565)
android.app.NotificationManager.createNotificationChannels(NotificationManager.java:456)
android.app.NotificationManager.createNotificationChannel(NotificationManager.java:444)
net.agasper.unitynotification.UnityNotificationManager.CreateChannel(UnityNotificationManager.java:58)
net.agasper.unitynotification.UnityNotificationManager.createChannelIfNeeded(UnityNotificationManager.java:67)
net.agasper.unitynotification.UnityNotificationManager.SetNotification(UnityNotificationManager.java:77)
com.unity3d.player.UnityPlayer.nativePause(Native Method)
com.unity3d.player.UnityPlayer.l(Unknown Source:0)
com.unity3d.player.UnityPlayer$22.run(Unknown Source:2)
android.os.Handler.handleCallback(Handler.java:794)
android.os.Handler.dispatchMessage(Handler.java:99)
android.os.Looper.loop(Looper.java:173)
com.unity3d.player.UnityPlayer$e.run(Unknown Source:32)
UnityEngine.AndroidJNISafe.CheckException () (at <00000000000000000000000000000000>:0)
UnityEngine.AndroidJavaObject._CallStatic (System.String methodName, System.Object[] args) (at <00000000000000000000000000000000>:0)

always show me this exception.how to fix it...