[Python] Icons are not displayed when making diagrams (Python Diagrams)

I'm studying the Diagrams Python module. However, I can't figure out what the problem is - when trying to create the simplest schemes, the icons don't display. Here is a sample code:

from diagrams import Diagram
from diagrams.aws.compute import EC2
from diagrams.aws.database import RDS
from diagrams.aws.network import ELB

def creat_diagram():
with Diagram("Grouped Workers", show=True, direction="TB"):
ELB("lb") >> [EC2("worker1"),
EC2("worker2"),
EC2("worker3"),
EC2("worker4"),
EC2("worker5")] >> RDS("events")
creat_diagram()


That's what this code gives out:

the picture with the results

why aren't the icons displayed?

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