ios - XCode 6 : error when selecting a view with its storyboard ID -


this code :

let first = self.storyboard!.instantiateviewcontrollerwithidentifier("firstview")  as! uiviewcontroller let second = self.storyboard!.instantiateviewcontrollerwithidentifier("secondview")  as! uiviewcontroller

the first line ok. second line produces error :

unexpectedly found nil while unwrapping optional value

i've checked using correct storyboard id 1 thousand times, have copied , pastes it, rewritten , everything. problem elsewhere.

what other parameters may cause error ?


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