Error in the arduino code

This is my arduino code for interfacing with an ESP8266:

#include <ESP8266WiFi.h>

int incomingByte;
String value;
char a;
int flag=0;
String valueserial;
int valueint;

const char* ssid     = "NIDHI";
const char* password = "nidhi123";

String data;

void setup() {
  Serial.begin(9600);
  delay(6000);
  data = "";
  valueserial = "";

//
  Serial.println();
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
 //
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);

    Serial.print(".");

  }
  //
  Serial.println("");
  Serial.println("WiFi connected");  
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
//
}


void loop() {
  flag = 0;
  delay(5000);
  valueserial = "";
  // Use WiFiClient class to create TCP connections
  WiFiClient client;
String url = "/display.php";

if (Serial.available() > 0){
    while (Serial.available() > 0) {
                // read the incoming byte:
                incomingByte = Serial.read();
                valueserial += char(incomingByte);
              }
    if (incomingByte == '\n') {
      Serial.print("Value:");
      Serial.println(valueserial.toInt());
      Serial.print("String: ");
      Serial.println(valueserial);
      // clear the string for new input:
    }
    //valueint = Serial.parseInt();
    data = "?value=" + String(valueserial.toInt());

    url += data;
    delay(100);
    flag = 1;
}

if (client.connect("www.soil.pixub.com",80) && flag==1) { // REPLACE WITH YOUR SERVER ADDRESS
    client.print(String("GET ") + url + " HTTP/1.1\r\n" +
    "Host: soil.pixub.com\r\n" + 
    "Connection: close\r\n\r\n");
    Serial.println("!!!!DATA POSTED!!!!");
   } 

       //valueserial += '\0';
  //valueserial = Serial.read();
//  
Serial.println(data); 
//
  if (client.connected()) { 
    client.stop();  // DISCONNECT FROM THE SERVER
  }
//  
  Serial.println();
  Serial.println("closing connection");
//
}

And i am getting the following errors

Arduino: 1.6.12 (Windows 10), Board: "Arduino/Genuino Uno"

In file included from C:\Users\Akshay\Documents\Arduino\libraries\ESP8266WiFi\src/ESP8266WiFi.h:33:0,

                 from C:\Users\Akshay\Downloads\esp8266code\esp8266code.ino:3:

C:\Users\Akshay\Documents\Arduino\libraries\ESP8266WiFi\src/ESP8266WiFiType.h:26:19: fatal error: queue.h: No such file or directory

 #include <queue.h>

                   ^

compilation terminated.

exit status 1
Error compiling for board Arduino/Genuino Uno.

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