Error in "Musical Features" about exportify HOT 2 OPEN

import matplotlib.pyplot as plt
import requests
from PIL import Image
from io import BytesIO

plt.figure(figsize=(20, 40))

for i, category in enumerate(['Tempo', 'Acousticness', 'Instrumentalness', 'Liveness',
                              'Valence', 'Speechiness', 'Loudness', 'Energy', 'Danceability']):
    plt.subplot(9, 2, i * 2 + 1)
    plt.hist(data[category], bins=30)
    plt.text(min(data[category]), 0, r'$\mu=$' + str(data[category].mean())[:7], fontsize=12)
    plt.xlabel('Value')
    plt.ylabel('Num Songs')
    plt.title(category)

    plt.subplot(9, 2, i * 2 + 2)
    url = 'https://developer.spotify.com/assets/audio/' + category.lower() + '.png'
    response = requests.get(url)
    if response.status_code == 200:  # Check if the request was successful
        img = Image.open(BytesIO(response.content))
        plt.imshow(img)
    else:
        plt.text(0.5, 0.5, 'Image not found', ha='center', va='center')
    plt.axis('off')

plt.tight_layout(h_pad=2)