Turtle-inspired interactive Python project

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.

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