How to solve problem with Sublime Text?

Question

Sublime Text

I'm watching Sorax's Sublime tutorials and ran into this problem.
In order to highlight all spaces, I need to write the line in Preferences.sublime-settings:
"draw_white_space": "all",
But here's what happens to me, and when saving, this is the error it gives. ERROR
CODE Please tell me what could be the problem.

Answer 1

commas are wrong

{
  "font_size": 10,
  "draw_white_space": "all"
}