ESP8266(ESPDUINO-32) A programmer is required to upload

[P-inc]

#include <ESP8266WiFi.h>
#include <Servo.h>
#define IO13 13

const char* ssid = ""; // Enter WiFi network name here
const char* password = ""; // Enter WiFi password here

const int servoPin = 13; // Servo motor pin settings
Servo servo; // Create Servo object

WiFiServer server(80); // Create WiFiServer object

int servoPosition = 0; // Current position of the servo motor (0 degrees or 90 degrees)

void setup() {
Serial.begin(115200);
delay(10);

servo. attach(servoPin); //connect to servo motor pin

// WiFi connection
Serial.println();
Serial.println("Connecting to WiFi...");
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("WiFi connected.");
Serial.print("IP address: ");
Serial.println(WiFi.localIP());

server.begin();
}

void loop() {
WiFiClient client = server.available();
if (!client) {
return;
}

String request = client.readStringUntil('\r');
if (request.indexOf("/servo/on") != -1) {
// When approaching the "/servo/on" path, change the servo motor to ON state.
if (servoPosition == 0) {
servo.write(90); // Rotate servo motor to 90 degree position
servoPosition = 90;
}
} else if (request.indexOf("/servo/off") != -1) {
// When approaching the "/servo/off" path, change the servo motor to OFF state.
if (servoPosition == 90) {
servo.write(0); // Rotate servo motor to 0 degree position
servoPosition = 0;
}
}

// web page response
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println();
client.println("");
client.println("

Servo Control

");
client.println("

Turn Servo ON

");
client.println("

Turn Servo OFF

");
client.println("");

client.stop();
}

/////////////
. Variables and constants in RAM (global, static), used 28556 / 80192 bytes (35%)
║ SEGMENT BYTES DESCRIPTION
╠══ DATA 1504 initialized variables
╠══ RODATA 1196 constants
╚══ BSS 25856 zeroed variables
. Instruction RAM (IRAM_ATTR, ICACHE_RAM_ATTR), used 61183 / 65536 bytes (93%)
║ SEGMENT BYTES DESCRIPTION
╠══ ICACHE 32768 reserved space for flash instruction cache
╚══ IRAM 28415 code in IRAM
. Code in flash (default, ICACHE_FLASH_ATTR), used 248420 / 1048576 bytes (23%)
║ SEGMENT BYTES DESCRIPTION
╚══ IROM 248420 code in flash
A programmer is required to upload

The above error appears. Please tell me how to solve it.