Could not load NIB in bundle from within cocoapods framework

This is my directory structure:

And this is how I load nib from within BSSelectableView:

let nib = UINib(nibName: "BSSelectableTableViewCell", bundle: nil)
tableView.registerNib(nib, forCellReuseIdentifier: BSSelectableTableViewCellIdentifier)

and error is following:

2016-06-23 08:21:26.149 BSSelectableView_Example[12909:298370] *** Terminating app due to uncaught exception 'NSIntealInconsistencyException', reason: 'Could not load NIB in bundle: 'NSBundle (loaded)' with name 'BSSelectableTableViewCell''