ios - Could not cast value of type 'UIViewController' -

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i trying implement bwwalkthrough in project. error stating 

unknown class _ttc20bwwalkthroughexample27bwwalkthroughviewcontroller in interface builder file. not cast value of type 'uiviewcontroller' (0x195bca580) 'appname.bwwalkthroughviewcontroller' (0x10042c3a0). (lldb)

it pointing @ below code 

let walkthrough = stb.instantiateviewcontrollerwithidentifier("walk") as! bwwalkthroughviewcontroller

i don't know why happening, appreciated, thank you.

also feel free ask more code project.

your storyboard doesn't seem linked bwwalktroughviewcontroller. find view controller should bwwalktroughviewcontroller, , check if one.


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