Hola Tengo un ESP8266 NodemCu - cuando le subo el archivo json + sketch lo hace perfectamente, pero en el Serial Monitor me aparece la siguiente leyenda " ets Jan 8 2013,rst cause:2, boot mode3,7) ets_main.c " Si me pueden ayudar. agradezco mucho, saludos

Este es el código

// Example: storing JSON configuration file in flash file system
//
// Uses ArduinoJson library by Benoit Blanchon.
// https://github.com/bblanchon/ArduinoJson
//
// Created Aug 10, 2015 by Ivan Grokhotkov.
//
// This example code is in the public domain.
#include <ArduinoJson.h>
#include "FS.h"
bool loadConfig() {
  File configFile = SPIFFS.open("/config.json", "r");
  if (!configFile) {
    Serial.println("Failed to open config file");
    return false;
  }
  size_t size = configFile.size();
  if (size > 1024) {
    Serial.println("Config file size is too large");
    return false;
  }
  // Allocate a buffer to store contents of the file.
  std::unique_ptr<char[]> buf(new char[size]);
  // We don't use String here because ArduinoJson library requires the input
  // buffer to be mutable. If you don't use ArduinoJson, you may as well
  // use configFile.readString instead.
  configFile.readBytes(buf.get(), size);
  StaticJsonBuffer<200> jsonBuffer;
  JsonObject& json = jsonBuffer.parseObject(buf.get());
  if (!json.success()) {
    Serial.println("Failed to parse config file");
    return false;
  }
  const char* serverName = json["serverName"];
  const char* accessToken = json["accessToken"];
  // Real world application would store these values in some variables for
  // later use.
  Serial.print("Loaded serverName: ");
  Serial.println(serverName);
  Serial.print("Loaded accessToken: ");
  Serial.println(accessToken);
  return true;
}
bool saveConfig() {
  StaticJsonBuffer<200> jsonBuffer;
  JsonObject& json = jsonBuffer.createObject();
  json["serverName"] = "api.example.com";
  json["accessToken"] = "128du9as8du12eoue8da98h123ueh9h98";
  File configFile = SPIFFS.open("/config.json", "w");
  if (!configFile) {
    Serial.println("Failed to open config file for writing");
    return false;
  }
  json.printTo(configFile);
  return true;
}
void setup() {
  Serial.begin(9600);
  Serial.println("");
  delay(1000);
  Serial.println("Mounting FS...");
  if (!SPIFFS.begin()) {
    Serial.println("Failed to mount file system");
    return;
  }

 // if (!saveConfig()) {
   // Serial.println("Failed to save config");
  //} else {
    //Serial.println("Config saved");
  //}
 if (!loadConfig()) {
    //Serial.println("Failed to load config");
 } else {
    //Serial.println("Config loaded");
 }
}
void loop() {
}