.net Core Newtonsoft.Json had 'Exception has been thrown by the target of an invocation' error

I am developing on .net core 3.1 platform.

I use log4net for cross cutting concerns logging. When I take any error from any service, It will convert to json object then write to log file.

I use .NET STANDARD library 2.1, this is code bellow

    var logEvent = new SerializableLogEvent(loggingEvent);
    var json = JsonConvert.SerializeObject(logEvent, Formatting.Indented); // problem is this line
    writer.WriteLine(json);

this SerializableLogEvent.cs

[Serializable]
public class SerializableLogEvent
{
    private LoggingEvent _loggingEvent;

    public SerializableLogEvent(LoggingEvent loggingEvent)
    {
        _loggingEvent = loggingEvent;
    }

    public object Message => _loggingEvent.MessageObject;
}

Why have it error ? System.Reflection.TargetInvocationException: 'Exception has been thrown by the target of an invocation.'

  System.Reflection.TargetInvocationException
      HResult=0x80131604
      İleti=Exception has been thrown by the target of an invocation.
      Kaynak=System.Private.CoreLib
      StackTrace:
       at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor, Boolean wrapExceptions)
       at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
       at System.Reflection.MethodBase.Invoke(Object obj, Object[] parameters)
       at Newtonsoft.Json.Serialization.JsonContract.<>c__DisplayClass57_0.<CreateSerializationCallback>b__0(Object o, StreamingContext context)
       at Newtonsoft.Json.Serialization.JsonContract.InvokeOnSerializing(Object o, StreamingContext context)
       at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.OnSerializing(JsonWriter writer, JsonContract contract, Object value)
       at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeObject(JsonWriter writer, Object value, JsonObjectContract contract, JsonProperty member, JsonContainerContract collectionContract, JsonProperty containerProperty)
       at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeValue(JsonWriter writer, Object value, JsonContract valueContract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerProperty)
       at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeObject(JsonWriter writer, Object value, JsonObjectContract contract, JsonProperty member, JsonContainerContract collectionContract, JsonProperty containerProperty)
       at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeValue(JsonWriter writer, Object value, JsonContract valueContract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerProperty)
       at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeList(JsonWriter writer, IEnumerable values, JsonArrayContract contract, JsonProperty member, JsonContainerContract collectionContract, JsonProperty containerProperty)
       at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeValue(JsonWriter writer, Object value, JsonContract valueContract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerProperty)
       at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeObject(JsonWriter writer, Object value, JsonObjectContract contract, JsonProperty member, JsonContainerContract collectionContract, JsonProperty containerProperty)
       at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeValue(JsonWriter writer, Object value, JsonContract valueContract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerProperty)
       at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeObject(JsonWriter writer, Object value, JsonObjectContract contract, JsonProperty member, JsonContainerContract collectionContract, JsonProperty containerProperty)
       at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeValue(JsonWriter writer, Object value, JsonContract valueContract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerProperty)
       at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.Serialize(JsonWriter jsonWriter, Object value, Type objectType)
       at Newtonsoft.Json.JsonSerializer.SerializeInternal(JsonWriter jsonWriter, Object value, Type objectType)
       at Newtonsoft.Json.JsonSerializer.Serialize(JsonWriter jsonWriter, Object value, Type objectType)
       at Newtonsoft.Json.JsonConvert.SerializeObjectInternal(Object value, Type type, JsonSerializer jsonSerializer)
       at Newtonsoft.Json.JsonConvert.SerializeObject(Object value, Type type, Formatting formatting, JsonSerializerSettings settings)
       at Newtonsoft.Json.JsonConvert.SerializeObject(Object value, Formatting formatting, JsonSerializerSettings settings)
       at Newtonsoft.Json.JsonConvert.SerializeObject(Object value, Formatting formatting)
       at Core.CrossCuttingConcerns.Logging.Log4Net.Layouts.JsonLayout.Format(TextWriter writer, LoggingEvent loggingEvent) in ...\Core\CrossCuttingConcerns\Logging\Log4Net\Layouts\JsonLayout.cs:line 21
       at log4net.Appender.AppenderSkeleton.RenderLoggingEvent(TextWriter writer, LoggingEvent loggingEvent)
       at log4net.Appender.TextWriterAppender.Append(LoggingEvent loggingEvent)
       at log4net.Appender.FileAppender.Append(LoggingEvent loggingEvent)
       at log4net.Appender.AppenderSkeleton.DoAppend(LoggingEvent loggingEvent)
    
    
    
    PlatformNotSupportedException: This instance contains state that cannot be serialized and deserialized on this platform.