I am a Pro user but cant use flipping cards !!

<!-- Rotating card --> <div class="card-wrapper"> <div id="card-1" class="card-rotating effect__click text-center h-100 w-100"> <!-- Front Side --> <div class="face front"> <!-- Image--> <div class="card-up"> <img class="card-img-top" src="https://mdbcdn.b-cdn.net/img/Photos/Others/photo7.jpg" alt="Image with a photo of clouds."> </div> <!-- Avatar --> <div class="avatar mx-auto white"><img src="https://mdbootstrap.com/img/Photos/Avatars/img%20(20).jpg" class="rounded-circle" alt="Sample avatar image."> </div> <!-- Content --> <div class="card-body"> <h4 class="font-weight-bold mb-3">Marie Johnson</h4> <p class="font-weight-bold blue-text">Web developer</p> <!-- Triggering button --> <a class="rotate-btn" data-card="card-1"><i class="fa fa-repeat"></i> Click here to rotate</a> </div> </div> <!-- Front Side --> <!-- Back Side --> <div class="face back"> <div class="card-body"> <!-- Content --> <h4 class="font-weight-bold">About me</h4> <hr> <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Maxime quae, dolores dicta. Blanditiis rem amet repellat, dolores nihil quae in mollitia asperiores ut rerum repellendus, voluptatum eum, officia laudantium quaerat? </p> <hr> <!-- Social Icons --> <ul class="list-inline py-2"> <li class="list-inline-item"><a class="p-2 fa-lg fb-ic"><i class="fa fa-facebook"></i></a></li> <li class="list-inline-item"><a class="p-2 fa-lg tw-ic"><i class="fa fa-twitter"></i></a></li> <li class="list-inline-item"><a class="p-2 fa-lg gplus-ic"><i class="fa fa-google-plus"></i></a></li> <li class="list-inline-item"><a class="p-2 fa-lg li-ic"><i class="fa fa-linkedin"></i></a></li> </ul> <!-- Triggering button --> <a class="rotate-btn" data-card="card-1"><i class="fa fa-undo"></i> Click here to rotate back</a> </div> </div> <!-- Back Side --> </div> </div> <!-- Rotating card -->

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