Keep getting an error in WorkSpaces when trying to import class Goblin(Monster).

import random

COLORS = ['yellow', 'red', 'blue', 'green']


class Monster(object):  
  min_hit_points = 1
  max_hit_points = 1
  min_experience = 1
  max_experience = 1
  weapon = 'sword'
  sound = 'roar'

  def __init__(self, **kwargs):
    self.hit_points = random.randint(self.min_hit_points, self.max_hit_points)
    self.experience = random.randint(self.min_experience, self.max_experience)
    self.color = random.choice(COLORS)
    self.weapon = kwargs.get('weapon', 'sword')
    self.sound = kwargs.get('sound', 'roar')

    for key, value in kwargs.items():
      setattr(self, key, value)

  def battlecry(self):
    return self.sound.upper()

  def battle_move(self):
    return self.weapon.upper()

class Goblin(Monster):
  max_hit_points = 3
  max_experience = 2
  sound = 'squeak'

I was able to import the Goblin before. Not sure what I did to mess it up.