I can't manage to use a MCP23S17 Port Expander with my ESp8266-12F which I program trough the Arduino IDE. I tried to reach the Expander by using the gpio_MCP23S17.h lib but couldn't make it work.
My circuit looks like that:

At GPA0 of the expander is a LED as well.
#include <Arduino.h>
#include <ESP8266WiFi.h>
#include <ESP8266WebServer.h>
#include <SPI.h>
#include <gpio_MCP23S17.h>
gpio_MCP23S17 expanderTwo(5, 0x21);
void setup()
{
expanderTwo.begin();
expanderTwo.gpioPinMode(OUTPUT);
}
void loop()
{
expanderTwo.gpioDigitalWrite(0, HIGH);
expanderTwo.gpioDigitalWrite(8, HIGH);
delay(500);
expanderTwo.gpioDigitalWrite(0, LOW);
expanderTwo.gpioDigitalWrite(8, LOW);
delay(500);
}
Time is running out and I have know Idea how to make it work neither I have found something helpfull on the web. Please help me

I'm quite a newbie at this stuff and also not very good in Englisch, so I would ask for your indulgence.
Thanks
Alex