Use of undeclared type 'NextGrowingInternalTextView'

[herotheone]

I installed NextGrowingTextView by using cocoapods
pod 'NextGrowingTextView'

In my ViewController.swift file :
import NextGrowingTextView <- This works fine.
var myTextView = NextGrowingTextView() <- This is also works fine.

I change UITextView object's class to NextGrowingInternalTextView in the Identitiy Inspector
But when i create an outlet from Main.storyboard like this:

@IBOutlet weak var ngTextView: NextGrowingInternalTextView! <- This guy throws me an error

'Use of undeclared type 'NextGrowingInternalTextView'

I really don't know what is the problem.

Thanks in advance