KC868-A16 V1.5 I2C PCF8574 address updated

[TurSolution]

I success read address ifof I2C 0x24, 25  0x21 0x22

This is my log:
Found address: 33 (0x21)
Found address: 34 (0x22)
Found address: 36 (0x24)
Found address: 37 (0x25)


but when try to do
pcf8574.begin() -> it is failed? waht can be the problem?


My code : 
// Set i2c address
PCF8574 pcf8574_1(0x24,4,5);
PCF8574 pcf8574_2(0x25,4,5);

  if (pcf8574_1.begin())
{
        Serial.println("PCF8574_1_OK");
    }
else
{
        Serial.println("PCF8574_1_KO");
    }


Serial.print("Init pcf8574_2...");
  if (pcf8574_2.begin()){
    Serial.println("PCF8574_2_OK");
  }else{
    Serial.println("PCF8574_2_KO");
  }

What cvan be the problem?
PCF8574 pcf8574_1(0x24);PCF8574 pcf8574_1(0x24);Serial.print("Init pcf8574_2...");
  if (pcf8574_2.begin()){
    Serial.println("PCF8574_2_OK");
rfrrr  }else{

w
    Serial.println("PCF8574_2_KO");
  }

  if (pcf8574_1.begin())
{
        Serial.println("PCF8574_1_OK");
    }
else
{
        Serial.println("PCF8574_1_KO");
    }
PCF8574 pcf8574_2(0x25);
PCF8574 pcf8574_2(0x25);PCF8574 pcf8574_1(0x24);
PCF8574 pcf8574_2(0x25);
pcf8574_1.begin() pcf8574_1.begin()pcf8574_1.begin()pcf8574_1.begin()