ios - Linker error in Xcode? -

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i getting weird error when attempt run app on simulator. error within following code/file. (i unsure of called):

undefined symbols architecture i386: "_main", referenced from: implicit entry/start main executable ld: symbol(s) not found architecture i386 clang: error: linker command failed exit code 1 (use -v see invocation)

there 2 parts of error above highlighted in red; "_main", referenced from: , linker command failed exit code 1 (use -v see invocation).

i have never encountered error before. therefore, unable fix it. here code in case necessary:

class viewcontroller: uiviewcontroller {  override func viewdidload() {     super.viewdidload()  }  override func didreceivememorywarning() {     super.didreceivememorywarning()  }  @iboutlet weak var strwordvalue: uilabel! @iboutlet weak var strinputfield: uitextfield!   func textfieldshouldreturn(textfield: uitextfield) -> bool{     textfield.resignfirstresponder()      let word = textfield.text     let score = scoreforword(word)      return true }  var textfield: uitextfield!          private let alphabet = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"]  func valueofletter(letter: character) -> int { let letterstring = string(letter).uppercasestring let index = find(alphabet, letterstring)  return index != nil ? index! + 1 : 0 }  func scoreforword(word: string) -> int {     let characters = array(word)     return characters.reduce(0) { sum, letter in sum + self.valueofletter(letter) }   }    func textfield(textfield: uitextfield, shouldchangecharactersinrange range: nsrange, replacementstring string: string) -> bool   { let currentword = textfield.text nsstring let newword = currentword.stringbyreplacingcharactersinrange(range, withstring: string)  let score = scoreforword(newword)  return true } }

please include explanation of error(s) mean.

this error message happen me few of months ago. library not supported simulator. need run on actual device instead of simulator.

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