10.8.2021 01:35:34 [Notification] Server logger started.
10.8.2021 01:35:34 [Notification] Game Version: v1.15.4 (Stable)
10.8.2021 01:35:35 [Event] Launching server...
10.8.2021 01:35:35 [Error] Failed reading file playergroups.json. Will stop server now. Exception: Newtonsoft.Json.JsonReaderException: Additional text encountered after finished reading JSON content: [. Path '', line 1, position 2.
   w Newtonsoft.Json.JsonTextReader.Read()
   w Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize(JsonReader reader, Type objectType, Boolean checkAdditionalContent)
   w Newtonsoft.Json.JsonSerializer.DeserializeInternal(JsonReader reader, Type objectType)
   w Newtonsoft.Json.JsonConvert.DeserializeObject(String value, Type type, JsonSerializerSettings settings)
   w Newtonsoft.Json.JsonConvert.DeserializeObject[T](String value, JsonSerializerSettings settings)
   w Vintagestory.Server.PlayerDataManager.LoadList[T](String name)
10.8.2021 01:35:35 [Notification] Server stop requested, begin shutdown sequence. Stop reason: Failed reading playerdata