fix rpc error (#894)

* fix rpc error

* format

Author: Jim8y

src/ApplicationLogs/LogReader.cs

@@ -87,14 +87,14 @@ protected override void OnSystemLoaded(NeoSystem system)
         public JToken GetApplicationLog(JArray _params)
         {
             if (_params == null || _params.Count == 0)
-                throw new RpcException(-32602, "Invalid params");
+                throw new RpcException(RpcError.InvalidParams);
             if (UInt256.TryParse(_params[0].AsString(), out var hash))
             {
                 var raw = BlockToJObject(hash);
                 if (raw == null)
                     raw = TransactionToJObject(hash);
                 if (raw == null)
-                    throw new RpcException(-100, "Unknown transaction/blockhash");
+                    throw new RpcException(RpcError.InvalidParams.WithData("Unknown transaction/blockhash"));
 
                 if (_params.Count >= 2 && Enum.TryParse(_params[1].AsString(), true, out TriggerType triggerType))
                 {
@@ -111,7 +111,7 @@ public JToken GetApplicationLog(JArray _params)
                 return raw ?? JToken.Null;
             }
             else
-                throw new RpcException(-32602, "Invalid params");
+                throw new RpcException(RpcError.InvalidParams);
         }
 
         #endregion