Turtle-inspired interactive Python project (codembark.com)

Turtle my first programing language <3.. i tried to introduce my kids with something similar but Scratch was more appealing...

I get the following error:

    Traceback (most recent call last):
      File "/app.py", line 1, in <module>
        import spider
    ModuleNotFoundError: No module named 'spider'

Steps to reproduce:

1. Visit https://www.codembark.com/

2. Click on "Start Coding Right Now"

3. Write "import spider" into app.py in the right panel

4. Click the Play button in the bottom middle panel.