Fatal error: Use of unimplemented initializer 'init()' for class Swift

I am using MarkdownTextView to add basic markdown to a UITextView. The TextView is a subclass of MarkdownTextView.

However when using copy and paste I get the following error

Fatal error: Use of unimplemented initializer 'init()' for class MarkdownTextStorage

This is how I use the TextStorage in my ViewController

let fonty = UIFont(name: font, size: fsize)

attributes.defaultAttributes[NSFontAttributeName] = fonty
attributes.orderedListAttributes?[NSFontAttributeName] = fonty
attributes.orderedListItemAttributes?[NSFontAttributeName] = fonty
attributes.unorderedListAttributes?[NSFontAttributeName] = fonty
attributes.unorderedListItemAttributes?[NSFontAttributeName] = fonty

let textStorage = MarkdownTextStorage(attributes: attributes)

do {
   textStorage.addHighlighter(try LinkHighlighter())
} catch let error {
    fatalError("Error initializing LinkHighlighter: \(error)")
}
   textStorage.addHighlighter(MarkdownStrikethroughHighlighter())
   textStorage.addHighlighter(MarkdownSuperscriptHighlighter())

if let codeBlockAttributes = attributes.codeBlockAttributes {
        textStorage.addHighlighter(MarkdownFencedCodeHighlighter(attributes: codeBlockAttributes))
 }

I have used the following initialiser but still have no luck

required public init?(coder aDecoder: NSCoder) {
    attributes = MarkdownAttributes()
    super.init(coder: aDecoder)
    commonInit()
}

Here's the full source code for the class

open class MarkdownTextStorage: HighlighterTextStorage {

fileprivate let attributes: MarkdownAttributes

// MARK: Initialization

/**
Creates a new instance of the receiver.

:param: attributes Attributes used to style the text.

:returns: An initialized instance of `MarkdownTextStorage`
*/
public init(attributes: MarkdownAttributes = MarkdownAttributes()) {
    self.attributes = attributes
    super.init()
    commonInit()

    if let headerAttributes = attributes.headerAttributes {
        addHighlighter(MarkdownHeaderHighlighter(attributes: headerAttributes))
    }
    addHighlighter(MarkdownLinkHighlighter())
    addHighlighter(MarkdownListHighlighter(markerPattern: "[*+-]", attributes: attributes.unorderedListAttributes, itemAttributes: attributes.unorderedListItemAttributes))
    addHighlighter(MarkdownListHighlighter(markerPattern: "\\d+[.]", attributes: attributes.orderedListAttributes, itemAttributes: attributes.orderedListItemAttributes))

    // From markdown.pl v1.0.1 <http://daringfireball.net/projects/markdown/>

    // Code blocks
    addPattern("(?:\n\n|\\A)((?:(?:[ ]{4}|\t).*\n+)+)((?=^[ ]{0,4}\\S)|\\Z)", attributes.codeBlockAttributes)

    // Block quotes
    addPattern("(?:^[ \t]*>[ \t]?.+\n(.+\n)*\n*)+", attributes.blockQuoteAttributes)

    // Se-text style headers
    // H1
    addPattern("^(?:.+)[ \t]*\n=+[ \t]*\n+", attributes.headerAttributes?.h1Attributes)

    // H2
    addPattern("^(?:.+)[ \t]*\n-+[ \t]*\n+", attributes.headerAttributes?.h2Attributes)

    // Emphasis
    addPattern("(\\*|_)(?=\\S)(.+?)(?<=\\S)\\1", attributesForTraits(.traitItalic, attributes.emphasisAttributes))

    // Strong
    addPattern("(\\*\\*|__)(?=\\S)(?:.+?[*_]*)(?<=\\S)\\1", attributesForTraits(.traitBold, attributes.strongAttributes))

    // Inline code
    addPattern("(`+)(?:.+?)(?<!`)\\1(?!`)", attributes.inlineCodeAttributes)
}

required public init?(coder aDecoder: NSCoder) {
    attributes = MarkdownAttributes()
    super.init(coder: aDecoder)
    commonInit()
}

fileprivate func commonInit() {
    defaultAttributes = attributes.defaultAttributes
}

// MARK: Helpers

fileprivate func addPattern(_ pattern: String, _ attributes: TextAttributes?) {
    if let attributes = attributes {
        let highlighter = RegularExpressionHighlighter(regularExpression: regexFromPattern(pattern), attributes: attributes)
        addHighlighter(highlighter)
    }
}

private func attributesForTraits(_ traits: UIFontDescriptorSymbolicTraits, _ attributes: TextAttributes?) -> TextAttributes? {
    var attributes = attributes
    if let defaultFont = defaultAttributes[NSFontAttributeName] as? UIFont , attributes == nil {
        attributes = [
            NSFontAttributeName: fontWithTraits(traits, font: defaultFont)
        ]
    }
    return attributes
}

}

Full Error Screenshot

Does anyone have any suggestions on how to fix the issue ?

from Fatal error: Use of unimplemented initializer 'init()' for class Swift