Sming Spiff Error

appsettings.h

/*
 * AppSettings.h
 *
 *  Created on: 13 ìàÿ 2015 ã.
 *      Author: Anakod
 */

#include <SmingCore/SmingCore.h>

#ifndef INCLUDE_APPSETTINGS_H_
#define INCLUDE_APPSETTINGS_H_

#define APP_SETTINGS_FILE ".settings.conf" // leading point for security reasons :)
#define APP_SETTINGS_FILE_1 ".settings1.conf" // leading point for security reasons :)

struct ApplicationSettingsStorage {
	String ssid;
	String password;
	String mqttUsername;
	String mqttPassword;
	String deviceID;

	bool state = false;

	void load() {
		DynamicJsonBuffer jsonBuffer;
		if (exist()) {
			int size;
			char* jsonString = new char[size + 1];
			if (fileExist(APP_SETTINGS_FILE)) {
				size = fileGetSize(APP_SETTINGS_FILE);
				fileGetContent(APP_SETTINGS_FILE, jsonString, size + 1);
			} else {
				size = fileGetSize(APP_SETTINGS_FILE_1);
				fileGetContent(APP_SETTINGS_FILE_1, jsonString, size + 1);
			}

			JsonObject& root = jsonBuffer.parseObject(jsonString);

			JsonObject& network = root["network"];
			ssid = network["ssid"].asString();
			password = network["password"].asString();

			mqttUsername = network["mqttUsername"].asString();
			mqttPassword = network["mqttPassword"].asString();
			deviceID = network["deviceID"].asString();

			state = network["state"];

			delete[] jsonString;
		} else {
			Serial.println("not prsent");
		}
	}

	void save() {
		DynamicJsonBuffer jsonBuffer;
		JsonObject& root = jsonBuffer.createObject();

		JsonObject& network = jsonBuffer.createObject();
		root["network"] = network;
		network["ssid"] = ssid.c_str();
		network["password"] = password.c_str();

		network["mqttUsername"] = mqttUsername.c_str();
		network["mqttPassword"] = mqttPassword.c_str();
		network["deviceID"] = deviceID.c_str();

		network["state"] = state;

		// Make copy by value for temporary string objects

		//TODO: add direct file stream writing
		String rootString;
		root.printTo(rootString);
		Serial.println("Here 1");






		if (fileExist(APP_SETTINGS_FILE)) {
			Serial.println("Here 2");
			fileSetContent(APP_SETTINGS_FILE, rootString);
		} else {
			Serial.println("Here 3");
			fileSetContent(APP_SETTINGS_FILE_1, rootString);   //<<<<<<<<<<<<<<<<<<<<<<<<<<<< This causes Error
		}

	}

	bool exist() {
		return fileExist(APP_SETTINGS_FILE) | fileExist(APP_SETTINGS_FILE_1);
	}
};

static ApplicationSettingsStorage AppSettings;

#endif /* INCLUDE_APPSETTINGS_H_ */