FileNotFoundException: StartupConfiguration.json not found, please open the bootstrapper to create a default configuration file (menu Window > Multiplayer > Bootstrapper)
Unity.Template.Multiplayer.NGO.Runtime.ConfigurationManager.LoadConfigurationFromFile (System.String configFilePath, System.Boolean createIfNotExists, System.Boolean updateIfOutdated) (at Assets/Scripts/Runtime/Shared/ConfigurationManager.cs:176)
Unity.Template.Multiplayer.NGO.Runtime.ConfigurationManager..ctor (UnityEngine.MonoBehaviour routineRunner, System.String configFilePath, System.Action`1[T] onFinished) (at Assets/Scripts/Runtime/Shared/ConfigurationManager.cs:113)
Unity.Template.Multiplayer.NGO.Runtime.CustomNetworkManager.OnApplicationStarted () (at Assets/Scripts/Runtime/Shared/CustomNetworkManager.cs:74)