From that screenshot you have selected lines 7 through to 20, and then evaluated them. Lines 7 and 20 are the markers that denote a code block in that file, not part of the code that should be evaluated. Select lines 8 through to line 19 and try again.
Please open new threads for issues that you face that are unrelated to installation, so that it’s easier for future users to find topical content by thread title, thanks!