Sharing images with UIActivityViewController doesn't work

I've created this function for sharing image, but I have a problem.

func shareImg(img: UIImage) {

        let imageShare = [ img ]

        let activityViewController = UIActivityViewController(activityItems: imageShare as [Any] , applicationActivities: nil)

        activityViewController.popoverPresentationController?.sourceView = self.view

        activityViewController.popoverPresentationController?.sourceRect = CGRect(x: self.view.bounds.midX, y: self.view.bounds.midY, width: 0, height: 0)

        activityViewController.popoverPresentationController?.permittedArrowDirections = UIPopoverArrowDirection.init(rawValue: 0)

        activityViewController.completionWithItemsHandler = { (type, _, _, error) in

            print(error)

        }

        self.present(activityViewController, animated: true, completion: nil)

    }

Every time I try to save image to photo library it gives me this error and it isn't saved.:

Error Domain=ALAssetsLibraryErrorDomain Code=-1 "Unknown error" UserInfo={NSLocalizedDescription=Unknown error, NSUnderlyingError=0x282e0ff60 {Error Domain=PHPhotosErrorDomain Code=3303 "(null)"}}

I've found that code 3303 refers to:

ALAssetsLibraryWriteIncompatibleDataError

And also it logs this into console:

[ShareSheet] connection invalidated

Can anyone please help me? Thanks in advance