How to run this code propery suggest me why this showing error

#include "serial.h"
#include "servo.h"
#include "functions.h"

class Smart_Segregator
	/*
	_____________________________________________________________
	|
	| Description
	| -----------
	| - This is a smart segregator which seperates dry and wet
	|   wet waste. (It cannot segregate metal or plastic)
	|
	|.............................................................
	|
	| Attributes
	| ----------
	| pin_1 : int
	|    -  Servo Motor pin number.
	|
	| pin_2 : int
	|    -  Moisture Sensor pin number.
	|
	| pin_3 : int
	|    - Touch Sensor pin number.
	|
	|............................................................
	|
	| Methods
	| -------
	| dry_waste()
	|       - Lid of the segregator slides towards right side.
	|
	| wet_waste()
	|       - Lid of the segregator slides towards left side
	|
	| neutral_state()
	|       - In which the lid of segregator is in the middle.
	|
	| execute()
	|       - Smart Segregator starts operating.
	|
	|___________________________________________________________
	*/
{
public:
	int servo_pin;
	int moisture_sensor_pin;
	int touch_sensor_pin;
	int detect_moisture;
	int detect_touch; 

	Servo servo;
	Serial serial;

	Smart_Segregator(int pin_1, int pin_2, int pin_3)
	{
		servo_pin = pin_1;
		moisture_sensor_pin = pin_2;
		touch_sensor_pin = pin_3;

		detect_moisture = 0;
		detect_touch = false;
	}

	void init()
	{
		serial.begin(9600);
		servo.attach(servo_pin);
		servo.write(90);

		pinMode(moisture_sensor_pin, INPUT);
		pinMode(touch_sensor_pin, INPUT);

		serial.println("Your Smart Segregator is ready to Segregate!");
	}

	void dry_waste()
	{
		servo.write(0);
	}

	void wet_waste()
	{
		servo.write(180);
	}

	void neutral_state()
	{
		servo.write(90);
	}

	void execute()
	{
		detect_moisture = analogRead(moisture_sensor_pin);
		detect_touch = digitalRead(touch_sensor_pin);

		if (detect_moisture > 85 && detect_touch == 1)
		{
			wet_waste();
		}

		else if (detect_moisture <= 85 && detect_touch == 1)
		{
			dry_waste();
		}

		else
		{
			neutral_state();
		}
	}
}

segregator = Smart_Segregator(8, 6, 2);

void setup()
{
	segregator.init();
}

void loop()
{
	segregator.execute();
}