Cannot convert value of type 'Range<String.Index>' (aka 'Range<String.CharacterView.Index>') to expected argument type 'NSRange' (aka '_NSRange')

I am trying to replace a substring with attributed String. Following is my code.

let searchText = self.searchBar.text!
let name = item.firstName ?? ""
let idNo = "Employee Id. \(item.employeeId ?? "NA")"

if let range = name.range(of: searchText, options: String.CompareOptions.caseInsensitive, range: nil, locale: nil)
{
    let attributedSubString = NSAttributedString.init(string: name.substring(with: range), attributes: [NSFontAttributeName : UIFont.boldSystemFont(ofSize: 17)])
    let normalNameString = NSMutableAttributedString.init(string: name)
    normalNameString.mutableString.replacingCharacters(in: range, with: attributedSubString)
    cell.name.attributedText = normalNameString
}
else
{
    cell.name.text = name
}

I am getting compile time error:

"Cannot convert value of type 'Range' (aka 'Range') to expected argument type 'NSRange' (aka '_NSRange')".

What should I change here?