'Why my TOSCA script is not closing the browser?

I am new to TOSCA, and completing my assessment for AS Level 1. Everything was fine until I reached Lesson 12 - Exercise 6. I followed all steps mentioned in the exercise and when I do "Run in Scratchbook" I get the below error.

Screenshots of the code and error:

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Solution 1:[1]

I would suggest using a asterix also before Demo. Depending on the title of the page it could be a reason that the window was not found. Can you share the exact titel of the window.

Also I would recommend using the Test Configuration Parameter "Browser" and define the Browser which should be automated.

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Mile_Lab