swift - Unable to Update User: UserCannotBeAlteredWithoutSessionError -

greetings parse neophyte:
task: update current user's attributes (in parse's user table).
problem: received 'usercannotbealteredwithoutsessionerror' error.

here's code:

func updateparseuser(newuser:user, sender:uiviewcontroller) {      let currentuser = pfuser.currentuser()      if ((currentuser) == nil) {         return     }      if let location = newuser.location {         currentuser["location"] = location     }      if let phone = newuser.phonenumber {         currentuser["phone"] = phone     }       currentuser["displayname"] = "turkey"      pfuser.currentuser().save()  } 

result:

error: parse::usercannotbealteredwithoutsessionerror (code: 206, version: 1.5.0) 

need create session or something?
remedy?

update sdk. had exact same issue. when updated 1.6.0 issue resolved itself.