Can someone explain to me how to error occures and how to fix it. im stuck.

```
from bs4 import BeautifulSoup
import requests

html_text = requests.get("https://www.onlinegrowlab.nl")
soup = BeautifulSoup(html_text , "lxml")

header = soup.find_all('h2', class_= 'article-card.horizontal' )

print(header)

```

error

```
  File "C:\Users\Thoma\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0\LocalCache\local-packages\Python39\site-packages\bs4\__init__.py", line 
312, in __init__
    elif len(markup) <= 256 and (
TypeError: object of type 'Response' has no len()

```