ios - Swift Parse and Search Bar not giving results -

i have parsetableviewcontroller, parsetableviewcell , uisearchbar outlet on view. data comes expected when search nothing happens , crashes app. here code, there no error. think i'm missing point here.. thank you

import uikit import parseui import parse  class profiltableviewcontroller: pfquerytableviewcontroller, uisearchbardelegate{      let backgroundimage = uiimage(named: "a.png")     var arka: uiimageview!      @iboutlet weak var searchbar: uisearchbar!      override func viewdidload() {         super.viewdidload()          arka = uiimageview(frame: view.bounds)         arka.contentmode = .scaletofill         arka.clipstobounds = true         arka.image = backgroundimage         arka.center = view.center         view.addsubview(arka)         self.view.sendsubviewtoback(arka)          tableview.backgroundview = arka          self.addeffect()     }     override init(style: uitableviewstyle, classname: string!) {         super.init(style: style, classname: classname)     }     required init(coder adecoder: nscoder) {         super.init(coder: adecoder)!          self.parseclassname = "profillistesi"         self.textkey = "profilename"         self.pulltorefreshenabled = true         self.paginationenabled = false     }     override func queryfortable() -> pfquery {         var query = pfquery(classname: "profillistesi")         if searchbar.text != "" {             query.wherekey("profilename", containsstring: searchbar.text!.lowercasestring)         }         query.cachepolicy = .cachethennetwork         query.orderbyascending("profilename")         query.limit = 1000         return query     }      func searchbartextdidendediting(searchbar: uisearchbar) {         searchbar.resignfirstresponder()          self.loadobjects()     }      func searchbarsearchbuttonclicked(searchbar: uisearchbar) {         searchbar.resignfirstresponder()         self.loadobjects()     }      func searchbarcancelbuttonclicked(searchbar: uisearchbar) {         searchbar.text = ""          searchbar.resignfirstresponder()         self.loadobjects()     }      override func viewdidappear(animated: bool) {         tableview.reloaddata()         searchbar.delegate = self     }      override func tableview(tableview: uitableview, cellforrowatindexpath indexpath: nsindexpath, object: pfobject?) -> profiltableviewcell {         var cell = tableview.dequeuereusablecellwithidentifier("profilsegue") as! profiltableviewcell!         if cell == nil {             cell = profiltableviewcell(style: uitableviewcellstyle.default, reuseidentifier: "profilsegue")         }         if let profil = object?["profilename"] as? string {             cell?.profillabel?.text = profil         }         if let sistem = object?["profiletype"] as? string {             cell?.sistemlabel?.text = sistem         }         return cell     }     override func prepareforsegue(segue: uistoryboardsegue, sender: anyobject?) {         if segue.identifier == "detaysegue" {             var detailscene = segue.destinationviewcontroller as! profildetayviewcontroller             if let indexpath = self.tableview.indexpathforselectedrow {                 let row = int(indexpath.row)                 detailscene.currentobject = (objects?[row] as! pfobject)             }         }     }      func addeffect()     {         let effect =  uiblureffect(style: uiblureffectstyle.dark)          let effectview  = uivisualeffectview(effect: effect)          effectview.frame  = cgrectmake(0, 0, self.view.frame.width, self.view.frame.height)          arka.addsubview(effectview)          arka.layer.cornerradius = 0          arka.layer.maskstobounds = true;     } }