Thanks for the assistance, but i got the solution. Actually there were two libraries which conflicting between them about Webserver.h..
Hello mates,
I'm facing an error do anyone have idea about this pls help. Here is the image.
Here, is the list of my all libraries which i'm using..
#include <Adafruit_GFX.h>
#include <RGBmatrixPanelGP.h>
#include <Arduino.h>
#include <AsyncTCP.h>
#include "SPIFFS.h"
#include "FS.h"
#include <ESPAsyncWebServer.h>
#include <Wire.h>
#include "RTClib.h"
#include <time.h>
#include <WiFi.h>
#include "WiFiUdp.h"
#include <NTPClient.h>
#include <AutoConnect.h>
#include <WiFiManager.h>
#include <FreeMonoBold12pt7b.h>
#include <kongtext4pt7b.h>
//objects
RTC_DS3231 rtc;
DateTime now;
WiFiManager wifiManager;
Preferences preference;
AsyncWebServer server(80);
WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP, "in.pool.ntp.org", 19800, 60000);
Thanks and Regards..