'WizFi250' does not name a type; did you mean 'WiFi'?

Hi I am using an Arduino Wi-Fi Sheild called 'Fi250'. On their official site, I have found some examples, however, on every example I am getting this error that says 'WizFi250' does not name a type; did you mean 'WiFi'?. Can you please help me with it?
Here is the code:

/*
//This demo use Arduino Leonardo or Seeeduino Lite. The jumper connect D0-WIFI_TX, D1_WIFI_RX; Let the boot pin not connect
*/
#include <Arduino.h>
#include <SoftwareSerial.h>
#include "WizFi250.h"

#define SSID      "STEST"   //Set your SSID
#define KEY       "87654321" //Set your phrase
#define AUTH       "WPA2" //Set the encrypt type

#define TSN_HOST_IP        "74.125.128.103" //google.com server
//#define TSN_HOST_IP        "115.239.210.26" //baidu.com server
//#define TSN_HOST_IP      "192.168.1.254"      // broadcast
#define TSN_REMOTE_PORT    80
#define LOCAL_PORT     9000

#define spi_CS  8

//SoftwareSerial sprintSerial(4,5);   // The software serial port is not stable.
WizFi250 wizfi250(&Serial1);
void setup() {
 
Serial.begin(115200);
Serial1.begin(115200);
while (!Serial);
pinMode(spi_CS,OUTPUT);
digitalWrite(spi_CS,HIGH);
Serial.println("--------- WIZFI250 TEST --------");
// wait for initilization of Wizfi250
  delay(1000);
  Serial.println("Join " SSID );
  delay(10);
  if (!wizfi250.join(SSID, KEY, AUTH)) {
    Serial.println("Failed join " SSID); 
  } else {
    Serial.println("Successfully join  "  SSID);
 
  wizfi250.clear();
  
  wizfi250.connect(TSN_HOST_IP,TSN_REMOTE_PORT,LOCAL_PORT);
  delay(10);
  wizfi250.send("GET / HTTP/1.1\r\n\r\n");
}
   char c; 
   for(int i=0;i<320;i++){
   if (wizfi250.receive((uint8_t *)&c, 1, 100) > 0) {
    Serial.print((char)c);
   }
   } 
}
void loop() {
   while (wizfi250.available()) {
    Serial.write(wizfi250.read());
  }
  while (Serial.available()) {
    wizfi250.write(Serial.read());
}
}

Here is the error:

In file included from D:\Arduino\libraries\WizFi250\src/WizFi250.h:19:0,

                 from C:\Users\p007z\OneDrive\Desktop\Wizfi250\Examples\Wizfi250_http\Wizfi250_http.ino:6:

D:\Arduino\libraries\WizFi250\src/utility/WizFi250_spi_drv.h:104:67: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]

  int   SendCmdWithTag  (const __FlashStringHelper* cmd, char* tag="[OK]", char* tag2="", int timeout=10000, ...);

                                                                   ^~~~~~

D:\Arduino\libraries\WizFi250\src/utility/WizFi250_spi_drv.h:104:86: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]

  int   SendCmdWithTag  (const __FlashStringHelper* cmd, char* tag="[OK]", char* tag2="", int timeout=10000, ...);

                                                                                      ^~

Wizfi250_http:21:1: error: 'WizFi250' does not name a type; did you mean 'WiFi'?

 WizFi250 wizfi250(&Serial1);

 ^~~~~~~~

 WiFi

C:\Users\p007z\OneDrive\Desktop\Wizfi250\Examples\Wizfi250_http\Wizfi250_http.ino: In function 'void setup()':

Wizfi250_http:25:1: error: 'Serial1' was not declared in this scope

 Serial1.begin(115200);

 ^~~~~~~

C:\Users\p007z\OneDrive\Desktop\Wizfi250\Examples\Wizfi250_http\Wizfi250_http.ino:25:1: note: suggested alternative: 'Serial'

 Serial1.begin(115200);

 ^~~~~~~

 Serial

Wizfi250_http:34:8: error: 'wizfi250' was not declared in this scope

   if (!wizfi250.join(SSID, KEY, AUTH)) {

        ^~~~~~~~

C:\Users\p007z\OneDrive\Desktop\Wizfi250\Examples\Wizfi250_http\Wizfi250_http.ino:34:8: note: suggested alternative: 'wizfi250Drv'

   if (!wizfi250.join(SSID, KEY, AUTH)) {

        ^~~~~~~~

        wizfi250Drv

Wizfi250_http:47:8: error: 'wizfi250' was not declared in this scope

    if (wizfi250.receive((uint8_t *)&c, 1, 100) > 0) {

        ^~~~~~~~

C:\Users\p007z\OneDrive\Desktop\Wizfi250\Examples\Wizfi250_http\Wizfi250_http.ino:47:8: note: suggested alternative: 'wizfi250Drv'

    if (wizfi250.receive((uint8_t *)&c, 1, 100) > 0) {

        ^~~~~~~~

        wizfi250Drv

C:\Users\p007z\OneDrive\Desktop\Wizfi250\Examples\Wizfi250_http\Wizfi250_http.ino: In function 'void loop()':

Wizfi250_http:53:11: error: 'wizfi250' was not declared in this scope

    while (wizfi250.available()) {

           ^~~~~~~~

C:\Users\p007z\OneDrive\Desktop\Wizfi250\Examples\Wizfi250_http\Wizfi250_http.ino:53:11: note: suggested alternative: 'wizfi250Drv'

    while (wizfi250.available()) {

           ^~~~~~~~

           wizfi250Drv

Wizfi250_http:57:5: error: 'wizfi250' was not declared in this scope

     wizfi250.write(Serial.read());

     ^~~~~~~~

C:\Users\p007z\OneDrive\Desktop\Wizfi250\Examples\Wizfi250_http\Wizfi250_http.ino:57:5: note: suggested alternative: 'wizfi250Drv'

     wizfi250.write(Serial.read());

     ^~~~~~~~

     wizfi250Drv

Multiple libraries were found for "WizFi250.h"
 Used: D:\Arduino\libraries\WizFi250
Multiple libraries were found for "SPI.h"
 Used: C:\Program
 Not used: D:\Arduino\libraries\SPI
Multiple libraries were found for "SoftwareSerial.h"
 Used: C:\Program
exit status 1
'WizFi250' does not name a type; did you mean 'WiFi'?

Invalid library found in D:\Arduino\libraries\ESP8266SdFat: no headers files (.h) found in D:\Arduino\libraries\ESP8266SdFat
Invalid library found in D:\Arduino\libraries\SoftwareSerial: no headers files (.h) found in D:\Arduino\libraries\SoftwareSerial
Invalid library found in D:\Arduino\libraries\wizfi250_Client: no headers files (.h) found in D:\Arduino\libraries\wizfi250_Client
Invalid library found in D:\Arduino\libraries\Wizfi250_http: no headers files (.h) found in D:\Arduino\libraries\Wizfi250_http
Invalid library found in D:\Arduino\libraries\wizfi250_Server: no headers files (.h) found in D:\Arduino\libraries\wizfi250_Server
Invalid library found in D:\Arduino\libraries\wizfi250_test: no headers files (.h) found in D:\Arduino\libraries\wizfi250_test

Are the WizFi250.h and WizFi250.cpp in the same folder with your ino sketch?