How do I setup a pawn to spawn with a Network game?

Whenever I try to start a game (in this case the FPS Template) with multiple clients
the additional clients fail to spawn and I get the warning:

“LogGameMode:Warning: Couldn’t spawn Pawn of type MyCharacter_C at PlayerStart”

According to the documentation/source code
this happens if SpawnActor fails. However, I can’t figure out the actual cause of it (no log entries).

	APawn* ResultPawn = GetWorld()->SpawnActor<APawn>(GetDefaultPawnClassForController(NewPlayer), StartLocation, StartRotation, SpawnInfo );

	if ( ResultPawn == NULL )
		UE_LOG(LogGameMode, Warning, TEXT("Couldn't spawn Pawn of type %s at %s"), *GetNameSafe(DefaultPawnClass), *StartSpot->GetName());

Okay, I found the answer in another post: Why am I unable to spawn second character in template? - Multiplayer & Networking - Unreal Engine Forums