How to use Keypad_MC17 library in Arduino-Ide

Question

I want to know the button pressed in the Serial-Monitor in Arduino-Ide. I am using Arduino-Uno Board and I have connected the MCP23017 IC via I2C Connection with Arduino-Uno board. I have connected the 5*5 Push-button Matrix with the pins of MCP23017. I am using the joe young/arduino_keypads library.I am not able to view the button pressed in the Serial-Monitor.

#include <Keypad_MC17.h>
#include <Keypad.h>        
#include <Wire.h>
#include <Adafruit_MCP23017.h>
#define I2CADDR 0 
Adafruit_MCP23017 mcp_1;

const byte ROWS = 5;    // five rows
const byte COLS = 5;    // five columns

//define the symbols on the buttons of the keypads
char hexaKeys[ROWS][COLS] = {
  {'1','2','3','4','5'},
  {'6','7','8','9','A'},
  {'B','C','D','E','F'},
  {'G','H','I','J','K'},
  {'L' ,'M','N','O','P'}

};

byte rowPins[ROWS] = { 15 , 14 , 13 , 12 , 11 };     //connect to the row pinouts of the keypad
byte colPins[COLS] = { 10 , 9  ,8 , 7 , 6 };        //connect to the column pinouts of the keypad

//initialize an instance of class NewKeypad
Keypad_MC17 customKeypad( makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS, I2CADDR); 

void setup(){

  Serial.begin(9600);
  Serial.println("Program Started" );

  //Begin I2C Devices
  Wire.begin();
  Wire.beginTransmission(0);
  if (Wire.endTransmission(0) == 0) Serial.println("I2C Device Not Found 0x00");
  else Serial.println("I2C 0x00 Connected Successfully");
  mcp_1.begin();

  // Begin Keypad Device
  customKeypad.begin( );

}

void loop(){
  char customKey = customKeypad.getKey();
  if (customKey != NO_KEY) {
    Serial.println(customKey);
  }

}