ios - Error displaying a prototype cell and its content -

i'm doing rob's udemy ios8 swift course , far good.

i use tab bar controller separate tabs: profile, ask, browse etc...

in 'ask' tab, input text , uploaded parse , want text displayed in 'browse' tab. browse tab table view prototype cell, added labels there display username , text.

my problem doesn't display text nor username parse. here code:

import uikit import parse  class browseviewcontroller: uitableviewcontroller{   var postedquestion = [string]() var usernames = [string]()     override func viewdidload() {     super.viewdidload()      var query = pfquery(classname:"post")      query.findobjectsinbackgroundwithblock {         (objects: [anyobject]?, error: nserror?) -> void in          if error != nil {                if let objects = objects as? [pfobject] {                 object in objects {                      self.postedquestion.append(object["postedquestion"] as! string)                      self.usernames.append(object["username"] as! string)                      self.tableview.reloaddata()                  }             }         } else {              println(error)         }     }   }  override func didreceivememorywarning() {     super.didreceivememorywarning()  }    override func numberofsectionsintableview(tableview: uitableview) -> int {      return 1 }  override func tableview(tableview: uitableview, numberofrowsinsection section: int) -> int {      return usernames.count }  override func tableview(tableview: uitableview, heightforrowatindexpath indexpath: nsindexpath) -> cgfloat {     return 227 }   override func tableview(tableview: uitableview, cellforrowatindexpath indexpath: nsindexpath) -> uitableviewcell {      var mycell:cell = self.tableview.dequeuereusablecellwithidentifier("mycell") as! cell       mycell.postedquestion.text = postedquestion[indexpath.row]     mycell.username.text = usernames[indexpath.row]      mycell.sizetofit()      return mycell  }  } 

error message:

nil

i can see loading data (from parse) gives me error message. doesn't crash tho.

thanks!