Swift Playgrounds is displaying an error

I am trying to make a dice rolling simulator but Swift is giving me this error:

error: expected '{' to start the body of for-each loop

for _ in 1...100

^

I am really confused since there is a "{" in my code:

import UIKit

var sum = 0

var dice = 0

for _ in 1...100 {

sum = 0

dice = Int(arc4random_uniform(6))

sum = dice + 1 + sum

dice = Int(arc4random_uniform(6))

sum = dice + 1 + sum

dice = Int(arc4random_uniform(6))

sum = dice + 1 + sum

print (sum)

}

What am I doing wrong?