How Do I Fix View Crash On Ios

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iOS

Swift

am working on a webview app which loads a local html file in bundle when view loads.
but he app crashes with a breakpoint on the line which reads the file.

this is how i read the file

let homefile = NSBundle.mainBundle().URLForResource("shome", withExtension: "html", subdirectory: "ShuttlePass")

How do i fix this please;