Is not in the same level collection as the net driver

Development Programming & Scripting Multiplayer & Networking
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1

Suddently I have a log saying the actor is not in the same level collection as the net driver.

[2018.07.23-08.12.53:442][237]LogNet: Verbose: UActorChannel::SetChannelActor: actor KServerBeaconLobbyClient /Game/Maps/M-Entry.M-Entry:PersistentLevel.KServerBeaconLobbyClient_0 is not in the same level collection as the net driver (KadeoNetDriver /Engine/Transient.KadeoNetDriver_1)!

And now the server crash on

void AOnlineBeaconHostObject::OnClientConnected(AOnlineBeaconClient* NewClientActor, UNetConnection* ClientConnection)
{
	UE_LOG(LogBeacon, Verbose, TEXT("OnClientConnected %s from (%s)"),
		NewClientActor ? *NewClientActor->GetName() : TEXT("NULL"),
		NewClientActor ? *NewClientActor->GetNetConnection()->LowLevelDescribe() : TEXT("NULL"));

	ClientActors.Add(NewClientActor);
}

The fails occurred in

FString UIpConnection::LowLevelDescribe()
{
	TSharedRef<FInternetAddr> LocalAddr = Driver->GetSocketSubsystem()->CreateInternetAddr();
	Socket->GetAddress(*LocalAddr);
	return FString::Printf
	(
		TEXT("url=%s remote=%s local=%s uniqueid=%s state: %s"),
		*URL.Host,
		*RemoteAddr->ToString(true),
		*LocalAddr->ToString(true),
		*PlayerId->ToDebugString(),
			State==USOCK_Pending	?	TEXT("Pending")
		:	State==USOCK_Open		?	TEXT("Open")
		:	State==USOCK_Closed		?	TEXT("Closed")
		:								TEXT("Invalid")
	);
}

Some values should be invalid.

First, where to check the level collection of actor and net driver ?

D.