You are probably missing one of the required ImagePickerDelegate
functions. Specifically these:
func wrapperDidPress(imagePicker: ImagePickerController, images: [UIImage])
func doneButtonDidPress(imagePicker: ImagePickerController, images: [UIImage])
func cancelButtonDidPress(imagePicker: ImagePickerController)
In the future if you notice this error again go to the declaration of the delegate and you'll see a class protocol
and that'll tell you what is required to implement said delegate. In this case:
public protocol ImagePickerDelegate: class {
func wrapperDidPress(imagePicker: ImagePickerController, images: [UIImage])
func doneButtonDidPress(imagePicker: ImagePickerController, images: [UIImage])
func cancelButtonDidPress(imagePicker: ImagePickerController)
}