"Not callable" (probably a very basic question, task 1 in a course)

[kwiide]

Hi
(Sorry if this kind of questions are not allowed, tried to scroll trough the forums without finding an answer to this problem my son is having in his first (!) task).

He gets the error message TypeError: "<invalid>"object is not callable on line 7 in main.py
You can see line here.

Anyone who can help? :)
And sorry again, if this is not the forum for beginnerbeginner questions.

Regards,
K
PS Suomi = Finnish