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macos - Converting PathForResource To String Returning nil Swift

When loading a local resource file in a mac app

let urlpath = NSBundle.mainBundle().pathForResource("myResource", ofType: "html");

Converting the resource path to a string for NSURL always returns nil

    println("resource path = (urlpath)") <---resource logged ok

    web.frameLoadDelegate = self;
    let requesturl = NSURL(string: urlpath!)

   println("URL String  = (requesturl)"),<---- returns nil

    let request = NSURLRequest(URL: requesturl!)
    web.mainFrame.loadRequest(request)

Which presumably is why im getting the error found nil while unwrapping an Optional value What am I missing here to correctly convert the pathForResource to a string?

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if let myFileUrl = NSBundle.mainBundle().URLForResource("yourFile", withExtension: "html"){
            // do whatever with your url
} 

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