Problem updating channel. HTTP error code -301

#include "ThingSpeak.h"

#include <ESP8266WiFi.h>

char ssid[] = "F"; // your network SSID (name)

char pass[] = "qwerty"; // your network password

int keyIndex = 0; // your network key Index number (needed only for WEP)

WiFiClient client;

unsigned long myChannelNumber = 919998; //SECRET_CH_ID;

const char * myWriteAPIKey = "1D95P000GF21W88Z"; // SECRET_WRITE_APIKEY;

int value1 = 0, value2 = 0, value3 = 0, value4 = 0;

void setup()

{

Serial.begin(9600);

WiFi.mode(WIFI_STA);

ThingSpeak.begin(client); // Initialize ThingSpeak

while (!Serial) {

;

}

}

void loop()

{

// Connect or reconnect to WiFi

if (WiFi.status() != WL_CONNECTED)

{

Serial.print("Attempting to connect to SSID: ");

Serial.println(SECRET_SSID);

while (WiFi.status() != WL_CONNECTED)

{

WiFi.begin(ssid, pass);

Serial.print(".");

delay(5000);

}

Serial.println("\nConnected.");

}

while (!Serial.available());

String incommingStr = Serial.readStringUntil('\n');

Serial.println(incommingStr);

// splitting incomingStr

int data1 = incommingStr.indexOf(','); //finds location of first ,

int value1 = incommingStr.substring(0, data1).toInt(); //captures first data String

int data2 = incommingStr.indexOf(',', data1 + 1 ); //finds location of second ,

int value2 = incommingStr.substring(data1 + 1, data2 + 1).toInt(); //captures second data String

int data3 = incommingStr.indexOf(',', data2 + 1 );

int value3 = incommingStr.substring(data2 + 1, data3 + 1).toInt();

int data4 = incommingStr.indexOf(',', data3 + 1 );

int value4 = incommingStr.substring(data3 + 1).toInt(); //captures remain part of data after last ,

// set the fields with the values

ThingSpeak.setField(1, value1);

ThingSpeak.setField(2, value2);

ThingSpeak.setField(3, value3);

ThingSpeak.setField(4, value4);

Serial.println(String(value1) + " " + String(value2) + " " + String(value3) + " " + String(value4));

// set the status

ThingSpeak.setStatus("4 fields added.");

// write to the ThingSpeak channel

int x = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);

if (x == 200)

{

Serial.println("Channel update successful.");

}

else

{

Serial.println("Problem updating channel. HTTP error code " + String(x));

}

delay(20000);

}