'Cannot update calendar firstWeekDay Swift 3.0

I'm trying to update the calendar firstWeekDay to something else (as far as I seen the default firstWeekDay is Sunday) but some errors occur.

private var calendar = Calendar.autoupdatingCurrent
calendar.firstWeekday = 3

// the 2nd line is here only to ask this question on StackOverFlow (is missing on my code because I am want the user to use its own calendar, not something forced by me. Check code+errors screenshot here

Note: I managed to do this at the beginning of the project with the same simple code but after a while I updated the app on my personal iPhone to check how it looks and behave on a real device and I noticed that the the first week day is not Monday anymore as my personal iPhone calendar is set.



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