I am setting up my sign up and login page using parse on xcode with swift but i keep getting a fatal error. Can somebody see what im doing wrong? -

this have far:

import foundation import parse import uikit import bolts  class signupviewcontroller: uiviewcontroller, uitextfielddelegate {       @iboutlet weak var statuslabel: uilabel!       @iboutlet weak var emailtextfield: uitextfield!       @iboutlet weak var passwordtextfield: uitextfield!       @iboutlet weak var createaccountbutton: uibutton!       override func viewdidload()     {         super.viewdidload()         // additional setup after loading view, typically nib.          emailtextfield.delegate = self;         passwordtextfield.delegate = self;     }      override func didreceivememorywarning()     {         super.didreceivememorywarning()         // dispose of resources can recreated.     }      @ibaction func createaccountbuttonpressed(sender: anyobject) {          if verifyemaildomain(self.emailtextfield.text)         {             createaccount(self.emailtextfield.text, password: self.passwordtextfield.text)         }         else         {             //self.statuslabel.text = "email domain not valid.";              let alert = uialertview()             alert.title = "invalid email domain"             alert.message = "make sure entered in address correctly. if did, ask system using pagemd! thanks."             alert.addbuttonwithtitle("close")             alert.show()         }       }      func verifyemaildomain(email: string) -> bool     {         var isverifieddomain = false         let userdomain: string = (email.componentsseparatedbystring("@")).last!          //nslog(userdomain)          let validdomainsfilelocation = nsbundle.mainbundle().pathforresource("validdomains", oftype: "txt")         var validdomainsfilecontent = nsstring(contentsoffile: validdomainsfilelocation!, encoding: nsutf8stringencoding, error: nil)         // nslog(validdomainsfilecontent! string)          let validdomains = validdomainsfilecontent!.componentsseparatedbystring("\n")         domain in validdomains         {             nslog(domain as! nsstring string)              if userdomain == (domain as? nsstring)             {                 isverifieddomain = true                 break             }         }          return isverifieddomain     }      func createaccount(email: string, password: string)     {         var newuser = pfuser()          newuser.username = email // want user login email.         newuser.email = email         newuser.password = password          newuser.signupinbackgroundwithblock { (succeeded: bool, error: nserror?) -> void in             if error == nil             {                 // account created successfully!                 if succeeded == true                 {                     self.statuslabel.text = "account created!"                 }             }             else             {                 if let errorfield = error!.userinfo                 {                     self.statuslabel.text = (errorfield["error"] as! nsstring) string                 }                 else                 {                     // no userinfo dictionary present                     // http://stackoverflow.com/questions/25381338/nsobject-anyobject-does-not-have-a-member-named-subscript-error-in-xcode                 }             }         }     }      func textfieldshouldreturn(textfield: uitextfield) -> bool     {         textfield.resignfirstresponder()         return true;     } } 

when run receive in terminal xcode:

fatal error: unexpectedly found nil while unwrapping optional value (lldb)  

and highlighted in green is:

var validdomainsfilecontent = nsstring(contentsoffile: validdomainsfilelocation!, encoding: nsutf8stringencoding, error: nil) 

what can avoid error? i'm trying create login uses emailverified feature parse keep receiving error , cant save email core or send verification email user. can make code work , stop error coming up?

in case, file @ validdominsfilecontent wasn't found. need make sure file included in bundle.

to that, open bundle-resources:

project > app target > build phases > copy bundle resources

there save file. should found swift.