parse.com - Parse and Swift Issue query -

this error message:

cannot invoke 'getobjectinbackgroundwithid' argument list of type '(string, (pfobject!,nserror!) -> void)'

this code looks like:

    func calldata(){      var query : pfquery = pfquery(classname: "questionsandanswers")     query.getobjectinbackgroundwithid("ixcrgclkk2"){         (object : pfobject!, error : nserror!) -> void in         if (error == nil){             self.question = object["question"] string!             self.answers = object["answers"] array!             self.answer = object["answer"] string!              if (self.answers.count > 0){                 self.questionlabel.text = self.question             }         } else {             nslog("there wrong!")         }     } } 

i have tried changing around exclamation point/question mark/nothing behind pfobject , nserror nothing works. however, if make question mark behind both pfobject , nserror new error message says:

'anyobject' not convertible 'string!';did mean use 'as!' force downcast?

if change code as! error:

cannot assign immutable value of type 'string!'

any ideas on how fix this? appreciated!

have : http://blog.parse.com/announcements/building-apps-with-parse-and-swift/

i think work

var query = pfquery(classname: "questionsandanswers")     query.getobjectinbackgroundwithid("ixcrgclkk2", block: { (object:pfobject?, error:nserror?) -> void in         if let error = error {             //error         } else if let object = object{             //do object pfobject             // such             var question:string = object.objectforkey("question") as! string          }     })