Multiple libraries were found servo.h

问题

Multiple libraries were found servo.h error. Please help to fix.

I am getting this error:

Error:

Arduino: 1.8.5 (Windows 8), Board: "NodeMCU 1.0 (ESP-12E Module), 80 MHz, 4M (3M SPIFFS), v2 Lower Memory, Serial1, None, Only Sketch, 115200"

Smart_Door:20: error: 'servo' does not name a type
 servo.attach(2); // attaches the servo on GPIO2 to the servo object 
 ^
Multiple libraries were found for "Servo.h"
 Used: C:\Users\Deepak\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.1\libraries\Servo
 Not used: C:\Program Files (x86)\Arduino\libraries\Servo
Using library ESP8266WiFi at version 1.0 in folder: C:\Users\Deepak\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.1\libraries\ESP8266WiFi 
Using library Servo at version 1.0.2 in folder: C:\Users\Deepak\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.1\libraries\Servo 
exit status 1
'servo' does not name a type

My code:

#include <ESP8266WiFi.h>
#include <Servo.h>

const char* ssid = "ssid name";
const char* password = "password";

Servo servo;//create servo object to control a servo 12 servo 
//object can be created on most boards

// Create an instance of the server
// specify the port to listen on as an argument
WiFiServer server(80);
servo.attach(2); // attaches the servo on GPIO2 to the servo 
object 

//int ledPin = 13;

void setup() {
  Serial.begin(115200);
  delay(1000);
  //connect to wifi network
  Serial.println();
  Serial.println();
  Serial.print("Connecting to ..");
  Serial.print(ssid);
  WiFi.begin(ssid);
  while(WiFi.status()!= WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println(" ");
  Serial.println("Wifi Connected");
  //Start Server
  server.begin();
  Serial.println("server started at..");
  Serial.println(WiFi.localIP());
}

void loop() {
  int pos; //to control servo motor
  //check if a client has connected
  WiFiClient client = server.available();
  if(!client) {
    return;
  }
  //wait until the client sends some data
  Serial.println("new client");
  while(!client.available()) {
    client.setNoDelay(1);
  }
  //Read the first line of the request
  String req = client.readStringUntil('/r');
  Serial.println(req);
  client.flush();
  //match the request  for the angle movement of the servo motor
  //for door lock
  if(req.indexOf("/lock/0") != -1) {
    //goes from 0 degrees to 180 degrees
    for(pos = 0; pos <= 180; pos += 1) {
      //tell servo to go to positon in variable 'pos'
      servo.write(pos);
      //wait 15ms for the servo to reach the position
      delay(15);
    }
  } else if(req.indexOf("/unlock/1") != -1) {
    //for unlock
    //goes from 180 degrees to 0 degrees
    for(pos = 0; pos <= 180; pos -= 1) {
      //tell servo to go to positon in variable 'pos'
      servo.write(pos);
      //wait 15ms for the servo to reach the position
      delay(15);
    }
  } else {
    Serial.println("invalid request");
    client.stop();
    return;
  }
  //return the response
  client.println("HTTP/1.1 200 OK");
  client.println("Content_Type: text/html");
  client.println("");//do not forget this one
  client.print("Door is");
  if(pos == 180) {
    client.print("Unlock");
  } else {
    client.print("lock");
  }
  Serial.println("client disconnected");
  //the client will actually be disconnected
  //when the function returns & 'client' object is destroyed
}

Please give me suggestions.

来源：https://stackoverflow.com/questions/49704566/multiple-libraries-were-found-servo-h