ESP8266WebServer ... previously declared here

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öffne mal einen neuen Sketch
kopiere das mal rein

#define uS_TO_S_FACTOR 1000000  /* Conversion factor for micro seconds to seconds */
#define TIME_TO_SLEEP 80  // 1800
//#define TIME_TO_SLEEP 50  // 1800
#include <SPI.h>
#include <ESP8266WiFi.h>
#include <ESP8266WebServer.h>
#include <ESP8266mDNS.h>
#include <WiFiClient.h>
#include <ThingSpeak.h>
#include <WiFiUdp.h>
#include <ArduinoOTA.h>
#include <PubSubClient.h>
extern "C" { 
#include "user_interface.h" // this is for the RTC memory read/write functions
}

// create web server
ESP8266WebServer webServer(80);

drück auf kompilieren.
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