I am getting an attribute error when running this code "print(self.x) AttributeError: Controller instance has no attribute 'x'"

edit

Code:

#!/usr/bin/env python 

import rospy
from geometry_msgs.msg import Twist 
import sys
import math
import time 
from turtlesim.msg import Pose

class Controller:

    def __init__(self):
        rospy.init_node('mover',anonymous = True)
        self.speed_publisher = rospy.Publisher('/turtle1/cmd_vel',Twist,queue_size =10)
        self.pose_subscriber = rospy.Subscriber('/turtle1/pose',Pose,self.callback)

        self.rate = rospy.Rate(10)



    def callback(self,msg):

        self.x = msg.x 
        self.y = msg.y



    def _move(self,speed,distance,direction = True):
        self.velocity_message = Twist()
        self.speed = speed
        self.distance = distance
        self.direction = direction
        print(self.x)
        current_x = 0
        current_y = 0
        current_theta = 0

        if self.direction == 1:
            self.velocity_message.linear.x = abs(self.speed)
        else:
            self.velocity_message.linear.x = -abs(self.speed)

        self.distance_moved = 0

        while not rospy.is_shutdown():
            rospy.loginfo("Turtlesim moves forward")
            self.speed_publisher.publish(self.velocity_message)
            self.rate.sleep()

            self.distance_moved = self.distance_moved + abs(0.5*math.sqrt(((self.x-current_x)**2)+(self.y-current_y)**2))
            print (self.distance_moved)
            if not (self.distance_moved<self.distance):
                rospy.loginfo('Reached')
                break

        self.velocity_message.linear.x = 0
        self.speed_publisher.publish(self.velocity_message) 
        rospy.spin()


if __name__ == '__main__':

    try:
        control = Controller()
        control._move(0.1,2,1)
    except rospy.ROSInterruptException:
        pass