FrameView makes crash the app

[xxZap]

I'm working with Xcode 9.0 and my app crashes everytime I use the lib with:

Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '<PKHUD.PKHUDProgressView: 0x7f91c75ec010; frame = (0 0; 156 156); clipsToBounds = YES; alpha = 0.85; layer = <CALayer: 0x600000a266a0>> has been added as a subview to <PKHUD.FrameView: 0x7f91c75e9860; baseClass = UIVisualEffectView; frame = (0 0; 156 156); clipsToBounds = YES; autoresize = LM+RM+TM+BM; layer = <CALayer: 0x600000a255c0>>. Do not add subviews directly to the visual effect view itself, instead add them to the -contentView.'

when: contentView.addSubview(_content)

inside FrameView.swift: internal var content: UIView { set }

I haven't seen this exception before. I tried both the swift3 and swift4 versions of the pod

The stacktree is: FrameView.content.setter PKHUD.contentView.setter static HUD.show(:onView:)

[PGLongo]

Try again the swift4 branch release, because this issue has been fixed