JSON-RPC.NET

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In our mind, params-related error should raise -32700 or -32602 error.

{
  "jsonrpc": "2.0",
  "error": {
    "code": -32603,
    "message": "Internal Error",
    "data": {
      "ClassName": "System.ArgumentException",
      "Message": "Невозможно преобразовать объект типа 'Newtonsoft.Json.Linq.JValue' к типу 'System.Guid'.",
      "Data": null,
      "InnerException": null,
      "HelpURL": null,
      "StackTraceString": "   в System.RuntimeType.TryChangeType(Object value, Binder binder, CultureInfo culture, Boolean needsSpecialCast)\\r\\n   в System.RuntimeType.CheckValue(Object value, Binder binder, CultureInfo culture, BindingFlags invokeAttr)\\r\\n   в System.Reflection.MethodBase.CheckArguments(Object[] parameters, Binder binder, BindingFlags invokeAttr, CultureInfo culture, Signature sig)\\r\\n   в System.Reflection.RuntimeMethodInfo.InvokeArgumentsCheck(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)\\r\\n   в System.Delegate.DynamicInvokeImpl(Object[] args)\\r\\n   в System.Delegate.DynamicInvoke(Object[] args)\\r\\n   в AustinHarris.JsonRpc.Handler.Handle(JsonRequest Rpc, Object RpcContext)",
      "RemoteStackTraceString": null,
      "RemoteStackIndex": 0,
      "ExceptionMethod": "8\\nTryChangeType\\nmscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089\\nSystem.RuntimeType\\nSystem.Object TryChangeType(System.Object, System.Reflection.Binder, System.Globalization.CultureInfo, Boolean)",
      "HResult": -2147024809,
      "Source": "mscorlib",
      "WatsonBuckets": null,
      "ParamName": null
    }
  },
  "id": "0d1b763d-e0cb-4261-818e-02d439eea8f4"
}

I think your right. -32602 seems to be the most specific for this case.

code	message	meaning
-32700	Parse error	Invalid JSON was received by the server.An error occurred on the server while parsing the JSON text.
-32600	Invalid Request	The JSON sent is not a valid Request object.
-32601	Method not found	The method does not exist / is not available.
-32602	Invalid params	Invalid method parameter(s).
-32603	Internal error	Internal JSON-RPC error.
-32000 to -32099	Server error	Reserved for implementation-defined server-errors.

You can reproduce this error, passing string to the method, which requires Guid.