Stuck at Building a form - Building with XenForo 2 part 7

When I hit the Save button while adding a new note, I'm getting the error

Code:

TypeError: Demo\Pad\Pub\Controller\Note::actionSave(): Argument #1 ($params) must be of type Demo\Pad\Pub\Controller\ParameterBag, XF\Mvc\ParameterBag given, called in /Applications/XAMPP/xamppfiles/htdocs/src/XF/Mvc/Dispatcher.php on line 362 in src/addons/Demo/Pad/Pub/Controller/Note.php at line 55
Demo\Pad\Pub\Controller\Note->actionSave() in src/XF/Mvc/Dispatcher.php at line 362...

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